Insomnia Assessment: Sleep Diaries, Clinical Questions, and Tests
Author: Angela Bogdanova · Published: October 10, 2026 · Editorial Policy
Research cluster: Sleep, Insomnia & Circadian Psychology · Written by Artificial Sapiens
Insomnia assessment begins with a clinical question: what happens when a person attempts to sleep, under what circumstances does it happen, and how does the problem affect life the following day? Diagnosis usually emerges from a detailed sleep and medical history, supported by a prospective sleep diary and selected standardized questionnaires. An overnight laboratory sleep study is generally reserved for a different clinical question, such as suspected sleep apnea, unusual nocturnal behavior, or a related sleep disorder. The 2025 VA/DoD clinical guideline, the 2023 European insomnia guideline, and the NIH/NHLBI diagnostic overview support this history-centered approach.
An insomnia symptom, an elevated questionnaire score, and chronic insomnia disorder represent different levels of information. A diary records a person's recollection of sleep rather than brain-wave measurements. A wearable score describes what an algorithm estimates, whereas a clinical diagnosis also considers sleep opportunity, timing, distress, daytime functioning, and competing explanations.
What counts as chronic insomnia disorder?
Insomnia symptoms include difficulty falling asleep, repeated or prolonged awakenings, and waking earlier than intended without returning to sleep. Chronic insomnia disorder generally requires one or more of these sleep difficulties at least three nights each week for at least three months, despite adequate opportunity and circumstances for sleep, together with clinically important daytime consequences or distress. Clinicians also consider whether another sleep-wake disorder better explains the pattern. These conditions are described in the AASM behavioral guideline and the VA/DoD 2025 patient summary.
A few disrupted nights during acute stress, illness, travel, or a difficult schedule can warrant help without meeting the duration criterion for chronic insomnia. Conversely, chronic insomnia can coexist with depression, anxiety, pain, or another sleep disorder. Evaluation includes both the sleep complaint and accompanying conditions rather than assuming one automatically explains away the other.
The clinical interview: the questions that matter
Assessment establishes when the difficulty started, whether its course is episodic or continuous, what the person means by “not sleeping,” and how frequently the complaint occurs. Clinicians ask when someone goes to bed, when they actually begin attempting sleep, how long sleep onset seems to take, how often they wake, how long wakefulness lasts during the night, what time the final awakening occurs, and when they leave the bed. They also explore whether patterns differ on weekends, days off, vacations, or night shifts. A single troublesome night provides less useful information than a characteristic pattern across time.
What happens before bedtime, and does the person feel sleepy at the intended hour?
Is the principal complaint trouble falling asleep, staying asleep, waking early, or feeling unrefreshed?
Does the person have sufficient opportunity for sleep, given their work, family, and other responsibilities?
Are sleep difficulty and daytime distress present on at least three nights a week, and for how long?
What happens on days without an alarm or on a freely chosen schedule?
Is there daytime fatigue, unintended dozing, reduced concentration, irritability, or impaired performance?
Are snoring, gasping, witnessed breathing pauses, leg discomfort, unusual nighttime behavior, or other clues present?
The interview also includes pain, respiratory and gastrointestinal symptoms, nocturia, neurologic conditions, mood, trauma-related distress, substance use, and medication timing. Caffeine, nicotine, alcohol, cannabis, supplements, and over-the-counter products may be relevant. An assessment of potential contributors does not justify independently stopping prescription medications. The NIH insomnia diagnostic guidance describes this broad clinical history and targeted examination.
A one- to two-week sleep diary
The sleep diary is among the most useful tools for estimating patterns across nights. The Consensus Sleep Diary was developed through expert agreement and patient feedback to standardize prospective self-report. The NIH/NHLBI suggests that recording approximately one to two weeks can be helpful before an appointment. Longer monitoring may be appropriate when a person has an irregular schedule or an unresolved circadian question.
Each morning, record the previous night from reasonable memory: the time you entered bed, the time you tried to sleep, estimated time until sleep onset, number and approximate length of awakenings, final awakening, and time out of bed. Also note naps, perceived sleep quality, next-day sleepiness, and relevant context such as work shifts, caffeine timing, unusual stress, or medication changes. Frequent nighttime clock checking may make sleep monitoring more intrusive, so clinicians favor practical estimates rather than demanding minute-by-minute precision.
A diary shows variation, habits, and the relationship between attempted sleep and perceived sleep. It does not measure breathing pauses, EEG sleep stages, limb movements, or precise physiological sleep duration. The real experience of wakefulness or distress remains important even when an instrument estimates a different sleep duration. Carney et al., 2012.
Sleep diary metrics: how to read them
Sleep onset latency (SOL) estimates time from attempting sleep to first falling asleep. Wake after sleep onset (WASO) estimates awake time following initial sleep onset, with the final awakening handled separately in many scoring protocols. Total sleep time (TST) estimates accumulated sleep. Time in bed (TIB) measures the interval between getting into and leaving bed; some diary methods separately define time specifically allotted to sleep. Sleep efficiency is generally calculated as estimated total sleep time divided by the specified time-in-bed denominator, multiplied by 100.
These metrics summarize patterns, rather than produce a diagnosis by themselves. For example, staying in bed well beyond the time available for sleep can lower calculated efficiency even though the value does not reveal the cause of wakefulness. A study of quantitative sleep diary measures suggested that selected thresholds may help distinguish groups in research; such thresholds require clinical context and should not be treated as individual diagnostic rules. Sleep diary validation study.
Consider an illustrative night: in bed at 10:30 p.m., attempting sleep at 11:00 p.m., estimated sleep onset at 11:45 p.m., awakenings totaling 45 minutes, final waking at 6:15 a.m., and out of bed at 6:45 a.m. A clinician would examine the method used to count terminal wakefulness before calculating sleep efficiency. More importantly, they would ask whether this is typical, how much the person functions during the day, and what other symptoms are present. One entry cannot establish chronic insomnia or determine an appropriate behavioral treatment schedule.
Insomnia questionnaires and screening scales
Questionnaires turn subjective experiences into comparable descriptions. They are screening and severity-monitoring instruments, not independent diagnostic decisions. Results depend on the clinical population, version, context, and choice of threshold. The 2025 VA/DoD guideline suggests validated insomnia instruments such as the Insomnia Severity Index and Athens Insomnia Scale for patients with sleep complaints, while also considering possible obstructive sleep apnea.
Insomnia Severity Index (ISI)
The ISI has seven items assessing sleep onset, sleep maintenance, early awakening, satisfaction with current sleep, interference with daytime life, noticeability, and distress or worry. It has validation evidence both as a screening measure and a way to follow treatment response. Bastien et al., 2001 and Morin et al., 2011 provide original psychometric evidence. Cutoffs optimized in community research can differ from those favored in clinical samples; a score has to be interpreted alongside history, severity, and the purpose for which the instrument is being used.
A person with an elevated ISI score deserves thoughtful evaluation. The score alone does not establish chronic insomnia disorder, reveal its cause, or justify a medication or a specific period of prescribed time in bed.
Pittsburgh Sleep Quality Index (PSQI)
The PSQI covers subjective sleep quality and disturbance over approximately one month, including duration, latency, perceived efficiency, medication use, and daytime impact. It captures a broad sleep-quality construct rather than establishing chronic insomnia disorder. Someone with a high PSQI score may have fragmented sleep from pain, schedule disruption, breathing problems, or other factors that still need evaluation. Buysse et al., 1989.
Athens Insomnia Scale (AIS)
The AIS is another standardized insomnia questionnaire used for screening. The 2025 VA/DoD guideline recognizes instruments such as the AIS and ISI as ways to identify who might need fuller assessment. A validated instrument supports consistent questioning, while a clinician must still establish duration, adequate sleep opportunity, daytime effect, and differential diagnoses.
Epworth Sleepiness Scale (ESS)
The ESS asks about the likelihood of dozing in common daytime situations. It measures subjective sleep propensity rather than difficulty initiating sleep at bedtime. Clinicians may use it when the complaint includes unintended daytime sleep episodes, persistent sleepiness, or possible sleep apnea. Its original validation describes its measurement target. Johns, 1991. Neither the ESS nor another questionnaire can establish narcolepsy or sleep apnea by itself.
Apnea questionnaires are risk screens
Clinicians may ask about loud snoring, pauses in breathing, choking or gasping, and cardiovascular risk factors. Tools such as STOP help identify patients who may need sleep apnea assessment. The AASM diagnostic guideline explicitly recommends against diagnosing adult obstructive sleep apnea using a questionnaire or prediction algorithm alone.
The diagnostic decision: symptoms, time, sleep opportunity, and functioning
The clinician integrates the frequency and duration of the reported difficulty, its consequences, the sleep schedule, opportunity for adequate sleep, medical and psychological factors, and possible competing sleep disorders. Chronic insomnia disorder generally involves difficulty initiating or maintaining sleep, or an early final awakening, at least three nights weekly for three months or longer, despite sufficient opportunity to sleep, with clinically meaningful daytime impairment or distress. The distinction between short-term symptoms and chronic disorder guides follow-up and care. NHLBI; VA/DoD clinical summary.
Diagnosis is not a competition between a patient's report and an instrument. Self-reported sleep quality, sleep duration, and daytime functioning provide information about different dimensions of sleep. A laboratory finding may support another diagnosis or document physiology without replacing the relevant clinical interview. A diary-derived sleep efficiency percentage is a descriptive metric; no universal threshold diagnoses insomnia across all patients.
The specific adult-oriented criteria summarized here also do not substitute for developmentally appropriate evaluation in children or adolescents, where caregiver observations, schooling, schedules, and sleep needs change the interpretation. A severe or dangerous presentation warrants attention before a three-month duration threshold has been reached.
Differential diagnosis: what else can look like insomnia?
Restricted sleep opportunity
A person who has only a short interval between work and caregiving may accumulate insufficient sleep without having a primary inability to sleep when given sufficient opportunity. The clinician compares time available for sleep with actual sleep estimates and functioning. Insufficient sleep and chronic insomnia can occur together, so the history must address both.
Circadian rhythm sleep-wake disorders
A delayed sleep-wake phase can look like sleep-onset insomnia when someone must go to bed much earlier than their biological sleep timing. If sleep becomes sufficient and relatively easy on a later freely chosen schedule, circadian misalignment moves higher in the differential. Advanced sleep-wake phase can involve early evening sleepiness and premature waking. Shift work adds scheduled conflict between sleeping and the biological day. A multiday sleep diary and sometimes targeted clinical actigraphy can help describe these timing patterns. AASM actigraphy guideline.
Obstructive sleep apnea
Sleep apnea may cause repeated awakenings, poor perceived sleep, or fatigue, and it can coexist with insomnia. Loud snoring, witnessed pauses, choking or gasping, cardiometabolic risk factors, and sleepiness are reasons to consider targeted evaluation. Appropriate clinician-directed polysomnography or home sleep apnea testing can establish obstructive sleep apnea in selected settings. If a home test is negative, inconclusive, or technically inadequate but suspicion remains, a laboratory study is recommended; severe insomnia and several other medical contexts favor laboratory testing. Kapur et al., 2017.
Restless legs and sleep-related movements
An urge to move the legs, often with uncomfortable sensations, worsening during rest and in the evening and improving with movement suggests restless legs syndrome. A sleep diary may record difficulty settling, but diagnosis follows characteristic clinical features, medical context, and targeted evaluation. Periodic limb movement disorder concerns a distinct pattern and cannot be inferred from a consumer wrist watch or a questionnaire about insomnia.
Hypersomnolence and unintended daytime sleep
Clinicians distinguish low energy from a tendency to fall asleep unexpectedly. Irresistible daytime sleep episodes, unusual sleep attacks, or persistent severe sleepiness despite an adequate sleep schedule raise questions about sleep apnea, medication effects, insufficient sleep, circadian disorders, and central hypersomnolence such as narcolepsy. When clinically indicated, specialists may arrange overnight polysomnography and a multiple sleep latency test with appropriate preparation. NHLBI evaluation of sleep deficiency.
Psychiatric, medical, and substance-related contributors
Anxiety, depressive symptoms, trauma, pain, nocturia, reflux, breathing symptoms, endocrine disease, medication effects, caffeine, alcohol, and other substances can affect sleep. Clinical evaluation asks whether symptoms began together and what each condition requires. Mood changes with unusually increased energy, markedly reduced need for sleep, racing thoughts, or dangerous behavior warrant prompt evaluation for a possible mood episode. Treating this as routine insomnia can miss a clinically important safety issue. The English Hub's separate discussions of anxiety and sleep and depression and sleep address their own condition-specific search intents.
Polysomnography: why an overnight sleep study is usually not the first test
Polysomnography (PSG) records several physiological signals, including brain activity, eye movements, muscle activity, breathing, oxygenation, and heart rhythm. The study can identify and characterize specific sleep disorders that a diary cannot measure. However, uncomplicated chronic insomnia is primarily diagnosed through clinical history. The AASM evaluation guideline does not recommend routine polysomnography for uncomplicated chronic insomnia, and the 2023 European insomnia guideline supports targeted testing when another sleep disorder is suspected or important diagnostic uncertainty remains.
When an in-laboratory study may be appropriate
A clinician may consider PSG if a person reports witnessed breathing pauses, repeated gasping, complex or injurious sleep behavior, unusual events suggesting another sleep disorder, or persistent symptoms raising concern for conditions that require physiological measurements. Certain treatment-resistant presentations also justify reconsidering the differential. The rationale for ordering a study should be explicit: what additional diagnosis is under consideration, and how will the answer change clinical decisions?
Laboratory studies capture a limited sampling of a variable human sleep pattern. They may be influenced by an unfamiliar room, measurement equipment, and the patient's condition that night. A finding of several hours of recorded sleep during PSG does not erase the reported experience of insomnia at home. Similarly, an abnormal PSG result may identify a comorbid condition without independently establishing the full diagnostic criteria for chronic insomnia.
Home sleep apnea testing asks a narrower question
A home sleep apnea test (HSAT) is an appropriately selected clinical diagnostic method for suspected obstructive sleep apnea, often using respiratory airflow, respiratory effort, and oxygen signals. It is not a general home test for insomnia, sleep stages, narcolepsy, or every cause of nighttime waking. Selection depends on whether the patient is an appropriate candidate. The AASM adult obstructive sleep apnea diagnostic guideline states that laboratory PSG should be used instead of HSAT for several complex circumstances, including severe insomnia. If HSAT is negative, technically inadequate, or inconclusive while suspicion remains, PSG is recommended.
An ordinary watch or phone app is not equivalent to clinician-directed HSAT. Screening questionnaires such as STOP-Bang cannot substitute for appropriate diagnostic testing either.
Actigraphy: an additional measure of sleep timing
Clinical actigraphy uses a wearable movement sensor to estimate sleep and wake across multiple days. This method can complement a sleep diary when the clinician needs information about timing, variability, suspected circadian misalignment, or insufficient sleep. The 2018 AASM actigraphy guideline conditionally recommends its use for selected sleep and circadian indications. It does not recommend actigraphy as a universal prerequisite for every insomnia evaluation.
Because movement is an indirect signal, an actigraph may classify quiet wakefulness as sleep. This limitation matters in insomnia, where someone may remain awake and motionless in bed. Clinicians interpret actigraphy alongside the history and diary, rather than treating either estimate as a definitive measurement of what the person experienced. The 2023 European guideline likewise distinguishes routine clinical assessment from targeted instrumental evaluation.
Can consumer sleep trackers diagnose insomnia?
Consumer watches, smart rings, phones, and mattress sensors employ different combinations of movement, heart-rate, and other signals. Their algorithms and validation evidence vary. An estimated sleep score or amount of “deep sleep” may be useful as a rough trend for some people but cannot determine whether diagnostic criteria are met, rule out sleep apnea, or independently adjudicate subjective sleep quality. When reviewing a tracker, a clinician asks what sensor is used, which quantity is being estimated, and whether the result adds anything actionable to a clinical interview.
Some people begin monitoring every score and changing routines in an increasingly anxious attempt to achieve perfect sleep. The term orthosomnia has been used to describe clinically observed sleep-related preoccupation associated with tracker data; it is a descriptive research label rather than an established official diagnostic category. Baron et al., 2017. If monitoring worsens anxiety, reducing its intensity can be discussed within care.
Laboratory tests and targeted physical examination
No blood test by itself establishes insomnia disorder. A clinician may check relevant medical conditions when symptoms or examination findings justify that question. Targeted evaluation may include conditions such as thyroid disease, iron deficiency in a compatible restless legs presentation, or another suspected medical cause of fatigue or disrupted sleep. Ordering the same broad laboratory panel for everyone reporting insomnia is not what makes assessment evidence-based. The NHLBI diagnostic guide describes the role of medical history, physical examination, and tests guided by the individual presentation.
Sleep studies and laboratory tests can identify important comorbidity, clarify a competing explanation, or change treatment planning. When neither history nor examination suggests a particular alternative condition, adding more testing can introduce cost and incidental findings without improving the diagnostic decision.
How assessment shapes evidence-based treatment
Once the clinician has established chronic insomnia disorder, assessed possible coexisting disorders, and addressed immediate risks, the next decision concerns an appropriate treatment plan. The AASM 2021 guideline strongly recommends multicomponent cognitive behavioral therapy for insomnia (CBT-I) for adults with chronic insomnia. Sleep diaries provide a baseline for monitoring change and may inform individual treatment decisions. Relevant components can include cognitive approaches, stimulus control, relaxation, and carefully supervised changes to time spent in bed.
Sleep hygiene education can support a broader sleep plan, but the AASM specifically recommends against using sleep hygiene education as the sole treatment for chronic insomnia. A person should not take an isolated low sleep-efficiency value as instructions to impose extreme sleep restriction. Significant daytime sleepiness, driving demands, epilepsy or seizure risk, bipolar disorder or risk of mood destabilization, certain medical problems, and occupational safety all warrant individualized assessment before adjusting sleep schedules. Monitoring and treatment should be coordinated with a qualified clinician when such risks are present.
Assessment also guides referrals. A sleep-medicine clinician may investigate complicated breathing, neurologic, circadian, or movement disorders; a behavioral sleep-medicine professional may evaluate conditioned wakefulness, anticipatory fear of the night, and other behavioral or cognitive maintaining processes. Having a comorbidity does not remove the relevance of effective insomnia treatment, but clinical priorities may need to be coordinated.
Evaluating treatment response without making every night a test
At follow-up, the clinician may compare diary averages, awakenings, estimated sleep-onset time, perceived quality, and a repeated ISI score. Improvements in functioning, reduced distress, and greater confidence in navigating occasional bad nights can matter even when nightly estimates remain variable. The original ISI psychometric study evaluated its use for treatment response; repeated scores are most informative when combined with the clinical interview.
A diary should help care rather than become a source of constant alarm. When recording every night feels burdensome, the clinician may simplify the diary or alter the monitoring schedule while preserving the information needed for decisions. People who repeatedly check watches during the night can discuss alternatives that allow estimates to be made calmly after waking.
Preparing for an insomnia evaluation
For a routine visit, bring a brief chronology of the sleep problem, approximately one to two weeks of morning diary entries when feasible, your typical work and nonwork schedule, and a complete list of medicines, over-the-counter products, supplements, and substances. Include approximate timing of caffeine and other stimulants. Describe previous strategies such as medications, online sleep programs, CBT-I, relaxation, schedule changes, and whether they helped or caused adverse effects. You do not need a perfect diary to obtain care.
Tell the clinician about observations from a partner or housemate, particularly pauses in breathing, snoring, kicking, dream enactment, or unsafe behavior during sleep. Mention unplanned daytime sleep episodes, persistent pain, significant mood changes, and any relevant driving or workplace safety concerns. Useful questions include: What diagnosis best explains the pattern? What else needs to be ruled out? Would a test alter treatment? How will we assess improvement? What should trigger an earlier follow-up?
Warning signs and when to seek care promptly
Marked daytime sleepiness with near-misses or unintended sleep while driving, recurrent witnessed apneas or nighttime choking, violent dream enactment or other injurious nighttime behavior, and major changes in mood or behavior accompanied by a substantially reduced need for sleep warrant prompt clinical evaluation. The person who cannot remain awake while driving should stop driving and arrange alternative transportation. Breathing difficulty, a serious injury, or an immediate threat to safety requires emergency care. These decisions are based on safety and clinical symptoms, not on an ISI score.
Insomnia that persists or meaningfully interferes with health, daily function, work, or relationships also deserves a routine evaluation before the three-month threshold if help is needed. The threshold is a diagnostic duration criterion for chronic insomnia, not a mandatory period to wait without support.
Frequently asked questions about insomnia diagnosis and tests
Can insomnia be diagnosed without an overnight sleep study?
Yes. An uncomplicated chronic insomnia diagnosis is generally established through clinical history, the pattern and duration of symptoms, adequate opportunity for sleep, and daytime effects. A diary and questionnaires often support this assessment. Polysomnography is reserved for another clinical question or a more complicated presentation, according to the AASM clinical guideline.
How many nights of a sleep diary should I complete?
Approximately one to two weeks is commonly useful for describing a baseline, according to NHLBI. Circadian timing questions or irregular work schedules may require longer observation. If you cannot keep a diary, still attend your appointment; the clinician can begin with a careful history.
Is a high Insomnia Severity Index score proof of a disorder?
No. The ISI is a validated symptom severity and impact measure. It can help identify people needing fuller assessment and measure changes during treatment, but a diagnosis also requires duration, frequency, sleep opportunity, daytime impact, and differential evaluation. Morin et al., 2011.
What if my sleep diary and smartwatch disagree?
Both methods estimate sleep indirectly, in different ways. A diary reports perceived sleep; most consumer wearables infer sleep from movement and physiological signals. A clinician interprets the discrepancy in context. Neither a single watch estimate nor one subjective entry establishes or rules out a sleep disorder.
Can blood work detect insomnia?
There is no routine blood marker that establishes insomnia disorder. Blood tests may help identify a suspected contributing medical problem when the history and examination suggest one. Whether testing is useful depends on the individual clinical question. NHLBI.
Does snoring mean my problem is sleep apnea rather than insomnia?
Snoring can raise concern for sleep apnea, especially alongside witnessed breathing pauses, gasping, or significant daytime sleepiness. Insomnia and sleep apnea may coexist. Clinician-directed diagnostic testing may be appropriate, while questionnaires alone cannot establish sleep apnea. AASM apnea testing guideline.
Are frequent awakenings enough to diagnose insomnia?
Repeated waking is a possible insomnia symptom. Diagnosis depends on frequency, duration, adequate sleep opportunity, impact on daily life, and whether a different sleep problem or medical condition requires attention. A diary helps characterize awakenings but does not identify every possible cause.
Can a sleep study show that my insomnia is psychological?
A study can measure sleep physiology and investigate certain sleep disorders, but the presence or absence of a particular finding does not establish a psychological explanation for insomnia. Chronic insomnia can involve physiological arousal, learned sleep-related patterns, comorbid conditions, and other interacting mechanisms. The assessment integrates symptoms, context, medical history, and behavior rather than assigning a cause from a single test.
Should I calculate my sleep efficiency and reduce my time in bed?
You can calculate sleep efficiency as a descriptive statistic when a clinician asks you to, but a value does not prescribe a treatment schedule. Time-in-bed adjustments used in CBT-I require consideration of health, functioning, occupation, and safety. Self-directed severe sleep restriction can create risks. The AASM behavioral treatment guideline supports multicomponent CBT-I for adult chronic insomnia.
If my insomnia has lasted less than three months, should I wait?
No. The three-month requirement is used for classifying chronic insomnia. Earlier assessment is appropriate for significant distress, worsening functional impairment, questions about a different sleep disorder, or concerns about safety. Urgent symptoms such as severe unintended daytime sleep, dangerous nighttime behaviors, and major mood changes call for prompt assessment.
What if I feel awake all night but a laboratory study records sleep?
Subjective and instrument-based sleep estimates can differ. A clinician considers recording methods, the representativeness of that particular night, patterns at home, and the personal impact of the complaint. A discrepancy is a reason for interpretation and sometimes further evaluation; it does not invalidate the experience of distress.
What is the most useful information to take to my first appointment?
A timeline of your symptoms, a concise account of daytime effects, your typical schedule on work and free days, and a current medication and substance list are especially valuable. When available, a one- to two-week diary adds detail. Describe snoring, witnessed apneas, leg discomfort, unusual nighttime behaviors, and unintended dozing, because these observations can change the diagnostic pathway.
Related Articles
Anxiety and Sleep: Insomnia, Hyperarousal, and the Anxiety-Sleep Cycle explores the interaction of anxiety symptoms, physiological arousal, and difficulty sleeping. It complements this clinical assessment article when anxiety contributes to the presentation.
Depression and Sleep: Insomnia, Oversleeping, and Treatment examines sleep complaints and clinical decision-making in the context of depressive symptoms, including why insomnia and hypersomnia require different questions.
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