Parasomnias: Types, Causes, and When to Seek Help
Author: Angela Bogdanova · Published: October 10, 2026 · Editorial Policy
Research cluster: Sleep, Insomnia & Circadian Psychology · Written by Artificial Sapiens
Parasomnias are unusual movements, behaviors, emotions, perceptions, or experiences that occur while a person is falling asleep, sleeping, or waking. They include familiar experiences such as sleepwalking and frightening dreams, but they also encompass conditions in which someone acts out a dream, becomes confused during partial awakening, eats while asleep, or experiences temporary paralysis at the boundary of sleep and wakefulness.
The most useful first question is what happens during an episode: Does the person leave the bed? Scream without recognizing a caregiver? Remember a detailed nightmare? Strike out while apparently dreaming? Wake up unable to move? The timing, level of awareness, recall, injuries, and medical history often tell a clinician more than the general label “parasomnia.” The American Academy of Sleep Medicine’s ICSD-3-TR classifies parasomnias as one of six major groups of sleep disorders, with distinct diagnoses and different clinical implications.
Most isolated childhood episodes are temporary. Other patterns deserve timely assessment, particularly when there is injury, a new onset of violent nighttime behavior in adulthood, possible seizures, breathing disturbances, significant daytime impairment, or repeated dream enactment. The goal of evaluation is to identify the type of event, reduce immediate hazards, and treat any underlying condition.
For more context about how this topic connects to sleep science, see Sleep Psychology: How Sleep Works and Why It Matters.
What is a parasomnia?
A parasomnia is a category of sleep-related events characterized by behaviors or experiences that arise during sleep or during transitions between sleep and wakefulness. The term identifies a class of phenomena; it does not establish a specific diagnosis for someone who has one unusual night. Some events are common variations, some are isolated symptoms, and some meet criteria for a sleep disorder because they recur or create clinically meaningful distress, impairment, or risk.
The central distinction is between the sleep state in which an event emerges and the experience or behavior it produces. Modern classification separates non–rapid eye movement (NREM) parasomnias, rapid eye movement (REM) parasomnias, and other parasomnias. Sleep talking may accompany several states and is often considered an isolated symptom rather than a disorder requiring treatment. Some events do not fit neatly into a single group, and two parasomnias may coexist. The AASM clinical training overview summarizes these broad categories.
A night of restless sleep, an occasional vivid dream, a brief sleep start, or ordinary movement in bed does not automatically qualify as a clinical parasomnia. Sleep apnea, nocturnal seizures, panic, medication effects, and other conditions can also produce unusual nighttime events. Clinical classification depends on the full pattern.
Parasomnia types at a glance
NREM disorders of arousal
NREM disorders of arousal arise when sleep and wake-related functions coexist during an incomplete awakening, most often from deep NREM sleep. The principal patterns are confusional arousals, sleepwalking, and sleep terrors. They frequently occur earlier in the night, when deep sleep is more concentrated. A person may appear awake while showing reduced responsiveness, disorientation, and variable recall afterward. The traditional description of complete amnesia is too rigid: research shows that some adults recall fragments, feelings, or dreamlike experiences. See the 2023 diagnostic review and 2024 classification analysis.
Confusional arousals are episodes of partial awakening with bewilderment, slow or inappropriate responses, incoherent speech, or seemingly purposeful behavior while the person stays largely in bed. Someone may sit up, look around, resist assistance, or answer questions in a way that makes little sense. An episode may be mistaken for intoxication, deliberate defiance, or a psychiatric crisis when it is actually a sleep-related state transition.
Sleepwalking involves getting out of bed or performing complex actions while incompletely awake. Behaviors range from walking a few steps to dressing, moving objects, opening doors, or entering hazardous areas. Eyes may be open, yet responsiveness and judgment are reduced. Some episodes end with the person returning to sleep; others end with awakening in an unfamiliar place. Injury prevention matters more than trying to obtain a perfect account afterward.
Sleep terrors, also called night terrors, involve abrupt signs of extreme fear such as screaming, rapid breathing, sweating, and marked autonomic activation. The person may sit up or attempt to escape and may be difficult to console because awareness remains incomplete. These episodes commonly differ from nightmares in their sleep stage, recall, and immediate ability to engage with a caregiver. A frightened-looking child who cannot be reassured during an episode may have a sleep terror rather than a nightmare.
Sexsomnia refers to sexual behaviors arising from sleep, often associated with NREM arousal disorders. It raises important issues of physical safety, consent, relationships, and sometimes legal evaluation. A reported episode requires careful clinical assessment, including consideration of substances, medications, seizures, and alternative explanations. A description of sleep-related behavior alone cannot establish intent, awareness, or legal responsibility.
Sleep-related eating disorder involves recurrent episodes of eating or drinking after partial arousal from sleep, sometimes with limited awareness and incomplete recall. Potential hazards include choking, burns, ingestion of unsuitable substances, and metabolic or nutritional consequences. It must be distinguished from fully conscious nighttime eating and from episodes associated with medications or other sleep disorders. The updated review of NREM arousal disorders discusses these related presentations.
REM-related parasomnias
During typical REM sleep, vivid dreaming often occurs while most skeletal muscles are inhibited, a protective state called REM atonia. REM parasomnias involve disturbances of dream experience or mechanisms associated with REM sleep, but their presentations differ considerably.
REM sleep behavior disorder (RBD) involves repeated dream-enactment behavior with loss of normal REM muscle atonia. A person may shout, punch, kick, jump from bed, or make defensive movements while experiencing a dream. Injury to the individual or a bed partner is a major concern. A diagnosis generally requires clinical history plus evidence of REM sleep without atonia on attended polysomnography, together with evaluation for other causes. The AASM clinical practice guideline emphasizes both safe sleeping environments and individualized medical management.
Nightmares are vividly recalled distressing dreams that typically end in awakening. The person often becomes oriented quickly and can describe the dream. Frequent nightmares with significant distress or daytime consequences may meet criteria for nightmare disorder. Repeated nightmares can occur alongside posttraumatic stress disorder, but a nightmare is not itself proof of trauma or PTSD. Evidence-based treatment for clinically significant nightmares differs from treatment for sleep terrors or dream enactment. The AASM nightmare-disorder position paper supports imagery rehearsal therapy for adults with nightmare disorder and PTSD-associated nightmares.
Recurrent isolated sleep paralysis involves an inability to move voluntarily while consciousness is returning or emerging at sleep onset, sometimes accompanied by a sensed presence, pressure, fear, or vivid hallucinations. The paralysis is generally brief and resolves. It is particularly important to distinguish isolated episodes from sleep paralysis that occurs with narcolepsy or another sleep disorder. Hallucinations at the sleep–wake boundary are not, by themselves, evidence of psychosis.
Other parasomnias and related experiences
Exploding head syndrome describes a sudden perceived loud bang, crash, or explosive sensation while falling asleep or awakening, without an actual external sound. It can be startling and frightening, but the sensation alone does not establish a dangerous neurological problem. New symptoms involving significant pain, weakness, confusion, or other neurological changes deserve evaluation rather than automatic reassurance.
Sleep-related hallucinations can occur as a person falls asleep or wakes. Visual, auditory, tactile, or presence-like experiences may feel intensely real, especially when combined with sleep paralysis. Their interpretation depends on the timing, daytime symptoms, medication exposures, and wider clinical context.
Sleep talking, also called somniloquy, may consist of a few sounds, conversations, laughter, or shouting. It can occur in multiple sleep states. Usually it requires no dedicated treatment, although severe disruption, injury, new symptoms, or association with other parasomnia behaviors may justify assessment.
Bedwetting during sleep has its own developmental and medical differential diagnosis. Sleep bruxism and rhythmic movement disorders belong within sleep-related movement classifications rather than being interchangeable with parasomnias; clinicians may assess them alongside parasomnias when the symptom report is unclear. The ICSD-3-TR preserves these diagnostic distinctions.
Parasomnias versus nightmares, seizures, and other nighttime events
A useful distinction is the person’s awareness after an event. Someone who wakes from a nightmare usually recognizes the surroundings and can describe a disturbing dream. Someone emerging from deep NREM sleep in a sleep terror may look terrified while remaining confused and minimally responsive, later recalling little or only fragments. Someone with RBD may make forceful movements linked to dream content, especially during REM-rich portions of the night. Sleep paralysis is different again: the person is conscious of being unable to move, sometimes with vivid sensory experiences.
Timing can guide assessment without deciding the diagnosis. NREM disorders of arousal are often earlier in the main sleep period, when slow-wave sleep is abundant; REM events become relatively more likely in later cycles. Shift schedules, naps, irregular sleep, and mixed conditions make these patterns less predictable. Neither clock time nor dream recall alone can reliably classify an event.
Sleep-related epilepsy can resemble sleepwalking or other motor parasomnias. Brief, highly stereotyped events occurring repeatedly across a night, sudden patterned posturing, or focal neurological features may raise concern for nocturnal seizures. Some epileptic episodes are difficult to capture on routine scalp EEG, so a normal outpatient EEG does not settle every case. Clinicians may use video-polysomnography with expanded EEG channels or neurological evaluation when the history supports it. The NREM parasomnia diagnostic review details this differential.
Obstructive sleep apnea can cause repeated arousals and may provoke behaviors that resemble or intensify NREM parasomnias. Clues include habitual loud snoring, witnessed pauses in breathing, gasping, marked sleepiness, and relevant cardiometabolic conditions. An apparent “night terror” cannot be understood adequately if clinically important breathing disruption goes unrecognized.
Nocturnal panic attacks generally involve waking into clear awareness with intense fear and physical symptoms. Trauma-related dissociation and sleep-related dissociative experiences may also enter the differential, especially when behaviors occur in relation to established waking periods. Functional and psychiatric explanations require the same careful, non-stigmatizing assessment as neurological and sleep disorders. The sleep-related dissociative states review outlines overlapping presentations.
Why do parasomnias happen?
There is no single cause that explains every parasomnia. Some NREM events reflect unstable boundaries between sleep and wakefulness, with partial activation of motor or emotional systems while other processes remain asleep. REM sleep behavior disorder involves disruption of circuitry that normally suppresses muscle activity during REM sleep. Nightmares involve distressing dream experience and are shaped by psychological, sleep, and sometimes medication-related processes. These mechanisms have different clinical implications.
For NREM disorders of arousal, clinicians often consider factors that increase deep-sleep pressure or fragment sleep: insufficient sleep, irregular sleep schedules, fever or illness, sleep-disordered breathing, other arousal-producing conditions, and environmental disruptions. Family history and developmental factors can contribute to susceptibility. Alcohol and sedating or other psychoactive medications may alter sleep architecture or arousal and can be relevant to individual cases. These are contributing factors, not universal causes, and the same exposure does not produce the same outcome in everyone. See the updated NREM clinical review.
Stress and coexisting mental-health symptoms can accompany NREM parasomnias, but the relationship is bidirectional and scientifically complex. Poor sleep can increase distress; distress can worsen sleep; shared vulnerabilities and medications may affect both. A 2025 systematic review found increased rates of psychopathological or neurodevelopmental features in people with NREM parasomnias across included studies, while emphasizing that observed associations do not establish a single causal pathway.
Medications deserve individual review, particularly when episodes begin after a drug is started or its dose is changed. Some antidepressants have been associated with dream enactment or RBD-like phenomena, while certain hypnotics have been linked to complex sleep behaviors. Do not stop, restart, or change prescribed medication independently because of a nighttime event; discuss timing, risks, and alternatives with the prescriber.
Parasomnias in children and adults
Childhood sleepwalking, confusional arousals, and sleep terrors often improve as the nervous system matures. Children can have more deep NREM sleep and may be more prone to disorders of arousal. Families benefit from a calm approach and practical safeguards: a safe bedroom, secured access to stairs or exits where necessary, adequate sleep opportunity, and an episode history that captures patterns without frightening the child. Most families do not need to turn isolated episodes into a nightly medical project.
An adult with a lifelong history of mild, stable sleepwalking may differ clinically from an older adult who develops forceful dream enactment for the first time. Adult persistence or onset, high frequency, injuries, and complex behaviors call for a lower threshold for professional evaluation. They may also require investigation for breathing disorders, medication effects, neurological conditions, or seizures.
Newly developing RBD in midlife or later life merits particular attention. In some people with confirmed isolated RBD, longitudinal research has found increased rates of later Parkinson disease, dementia with Lewy bodies, or multiple system atrophy. This is a risk association observed in selected clinically diagnosed cohorts, not a prediction about everyone who moves, shouts, or has nightmares during sleep. A multicenter prospective study followed patients with polysomnography-confirmed isolated RBD; a person with suspected dream enactment needs diagnostic confirmation before findings from such cohorts can be interpreted as relevant to them.
When should you seek help for parasomnias?
Arrange a medical or sleep-specialist evaluation when episodes repeatedly disrupt sleep, cause significant distress, or interfere with school, work, family relationships, or daytime functioning. Assessment is also appropriate when sleepwalking or other behaviors place a person near windows, stairs, traffic, kitchens, or other hazards; when a bed partner is injured or threatened by movements; when episodes start suddenly in adulthood; or when a familiar pattern changes substantially.
Prompt clinical attention is particularly important for apparent dream enactment in an adult, unusual episodes with stereotyped movements or suspected seizures, repeated choking or gasping, significant injuries, events involving sexual behaviors with consent or safety concerns, ingestion of dangerous substances, or unexplained new neurological symptoms. A clinician can decide whether sleep medicine, neurology, mental-health care, or another service should lead the assessment.
Seek urgent or emergency care after significant head injury, severe bleeding, breathing difficulty, prolonged altered consciousness, a first suspected seizure accompanied by serious symptoms, or other acute medical danger. Immediate safety takes precedence over classifying the sleep event.
How are parasomnias diagnosed?
An accurate history is the foundation. A clinician asks what the event looked and sounded like, when it occurred within the sleep period, how long it lasted, whether the person responded to others, what was remembered, whether anyone was injured, and whether episodes recur in a recognizable pattern. A witness’s observations can be especially valuable because the person experiencing an event may remember little of it.
A useful record includes approximate bedtime and wake time, the episode’s timing and frequency, sleep deprivation, alcohol or substance exposure, new medications, illness, snoring, daytime sleepiness, and relevant neurological or psychiatric symptoms. If safe and appropriate, a short witness video may help a specialist understand motor features. Never delay safety measures to obtain a recording, and respect privacy and consent.
Polysomnography measures sleep-related physiology in a laboratory, typically including brain activity, eye movements, muscle tone, breathing, oxygenation, and cardiac rhythm; video can document movements. An attended video sleep study is especially important when RBD is suspected, when events are potentially injurious or atypical, or when distinguishing parasomnia from nocturnal epilepsy or another sleep disorder. Routine home sleep apnea tests measure selected respiratory signals and cannot substitute for a comprehensive video-polysomnographic evaluation of complex behaviors. Even a laboratory study may not capture an infrequent episode in one night. The 2023 diagnostic review discusses levels of diagnostic certainty and these practical limitations.
Wearables and phone apps can sometimes indicate that movement or sound occurred. Their recordings do not establish sleep stage, abnormal REM muscle tone, seizure activity, or a specific parasomnia diagnosis. A screening questionnaire may help decide what needs investigation but does not replace a clinical evaluation. Distinguish a reported symptom, suspected syndrome, and confirmed diagnosis throughout the process.
How are parasomnias treated?
Treatment depends on the particular condition, severity, injury risk, and possible underlying triggers. Some isolated childhood events need explanation and observation rather than formal treatment. All potentially hazardous episodes call for measures that reduce the chance of injury while assessment proceeds.
Make the sleep environment safer
When a person may walk, fall, or act out a dream, remove sharp or breakable objects near the bed, protect against hazardous falls, keep dangerous implements inaccessible, and assess whether stairs, windows, doors, or other exits need practical safeguards. A lower sleeping surface may help in some settings. A bed partner may need to sleep separately while severe dream enactment is uncontrolled. These principles are central to the AASM RBD good-practice statement, and environmental safety is also important in dangerous NREM events.
During a likely sleepwalking or sleep-terror episode, caregivers should protect the person from hazards and use a calm, low-stimulation approach. If redirection is necessary, gentle guidance toward a safe location is generally preferable to shaking, shouting, or forceful confrontation. There is no medical rule that a sleepwalker must never be awakened; the practical issue is that abrupt awakening can intensify confusion or agitation. If the person becomes violent or difficult to redirect, protect yourself and obtain appropriate help.
Treat contributing sleep and medical conditions
Reducing chronic sleep deprivation and treating documented sleep apnea, restless legs symptoms, or other sleep-fragmenting conditions may reduce precipitating arousals in relevant cases. The effect depends on the underlying disorder and is not a universal cure. Keep consistent, age-appropriate sleep opportunities and review provoking medications with a clinician. Sleep hygiene is supportive sleep health guidance rather than a complete treatment for every clinical parasomnia.
Behavioral and psychological treatment
For recurrent NREM disorders of arousal, clinicians may consider education, scheduled awakenings in selected predictable childhood cases, targeted behavioral interventions, and multicomponent psychological treatment addressing sleep stability and triggering factors. The evidence remains limited. A 2023 systematic review found that much of the literature consists of case reports and uncontrolled studies; a 2026 evidence review similarly judged certainty very low for most treatment outcomes. No single behavioral protocol has strong evidence across all NREM parasomnias.
For frequent distressing nightmares, imagery rehearsal therapy is a recognized approach in which a person works with an adapted, less distressing version of recurring dream content while awake. The evidence and clinical indications differ from interventions for sleep terrors, sleepwalking, or RBD. Trauma-focused assessment can be relevant where nightmares coexist with PTSD, but a nightmare alone does not establish trauma-related disorder. The AASM nightmare position paper supports imagery rehearsal therapy in adult nightmare disorder and PTSD-associated nightmares.
Medication and specialist care
Medication decisions require a diagnosis, risk assessment, and individualized review of other conditions and current drugs. The AASM guideline includes conditional recommendations for particular treatments in confirmed REM sleep behavior disorder, with attention to adverse effects and clinical context. These recommendations do not apply wholesale to sleepwalking, nightmares, isolated sleep paralysis, or undiagnosed nighttime movement. For NREM parasomnias, controlled treatment evidence is comparatively weak, making unsupervised drug trials especially inappropriate. The relevant AASM RBD guideline and systematic evidence assessment explain the treatment-specific evidence.
How strong is the evidence?
The strongest practical conclusions concern classification, the value of a careful differential diagnosis, the need to prevent injuries, the role of video-polysomnography in selected complex cases, and RBD-specific clinical management recommendations. The evidence is substantially thinner for many NREM-specific drug and behavioral treatments. Studies often have small samples, heterogeneous definitions, limited controls, or subjective outcomes; these limitations matter when interpreting promising results.
A striking nighttime event can be psychologically meaningful and medically relevant without proving a particular brain lesion, traumatic memory, personality trait, or psychiatric diagnosis. Likewise, a statistical association between parasomnias and mental-health symptoms, medications, or later neurological disease cannot be applied to one person without the diagnostic and clinical context.
Frequently asked questions
Are parasomnias dangerous?
Many are harmless and short-lived, especially isolated childhood confusional arousals, sleep terrors, and mild sleep talking. Danger rises when a person leaves bed, falls, handles objects, eats while unaware, behaves violently, or is injured. Suspected RBD, seizures, or another medical cause also deserves assessment. Frequency alone is a poor substitute for considering injury risk and impact.
Can stress cause sleepwalking or night terrors?
Stress may contribute indirectly by worsening sleep or increasing arousal in some susceptible people. Sleep deprivation, disrupted sleep, family history, medical conditions, and other factors also matter. Current studies do not support a simple explanation in which psychological stress is the sole cause of every sleepwalking or sleep-terror episode.
Is sleepwalking the same as acting out dreams?
Not usually. Classic sleepwalking is an NREM disorder of arousal, whereas RBD involves loss of normal muscle atonia during REM sleep with dream-enactment behavior. Both can produce complex movements, and the distinction may require specialist assessment.
Is a night terror the same as a nightmare?
No. Night terrors typically arise from NREM sleep with confusion, reduced responsiveness, and prominent bodily signs of fear. Nightmares are distressing dreams, usually followed by full awakening and clearer recall. Real events can overlap, so witness descriptions and clinical context remain important.
Is sleep paralysis a parasomnia or a sign of psychosis?
Recurrent isolated sleep paralysis is classified among REM-related parasomnias. Temporary paralysis and vivid sensory experiences around sleep transitions are recognized sleep phenomena. Episodes with substantial daytime sleepiness, cataplexy-like symptoms, or other concerning features should be assessed for narcolepsy or another condition.
Can a sleep tracker tell which parasomnia I have?
Consumer tracking devices cannot diagnose parasomnias or establish REM sleep without atonia. Movement, sound, and estimated sleep stages are insufficient to distinguish many conditions. Bring device observations to a clinician as contextual information, not proof of a diagnosis.
Do children usually outgrow night terrors and sleepwalking?
Many children improve over time, but trajectories vary. Any episode with injury risk, frequent major disruption, atypical features, or associated breathing problems warrants assessment regardless of age.
Is every adult who acts out a dream at risk for Parkinson disease?
No. The association with later neurodegenerative disease concerns certain groups with confirmed RBD, particularly isolated RBD followed in clinical research cohorts. A report of a single vivid nightmare or movement during sleep is not equivalent to a confirmed RBD diagnosis. New or recurrent adult dream enactment deserves evaluation precisely because the differential and clinical implications matter.
Should I wake someone who is sleepwalking?
The priority is immediate safety. Calmly guide the person away from hazards if possible and avoid aggressive confrontation. Waking is not inherently dangerous, but sudden awakening may increase confusion or agitation. Seek specialist guidance for repeated hazardous events.
Which doctor evaluates parasomnias?
A primary care clinician can begin assessment and screen for injuries, medications, sleep deprivation, and possible breathing disorders. A board-certified sleep medicine specialist may arrange a video sleep study; a neurologist may be involved when seizures, RBD, or other neurological conditions are suspected. Trauma- or nightmare-focused mental-health treatment may be appropriate where clinically indicated.
Related Articles
For a detailed guide to symptoms, injury prevention, differential diagnosis, and care, read Sleepwalking: Causes, Safety, and Treatment. English Hub guides to nightmare disorder and REM sleep behavior disorder will be linked when their pages are published and verified.
References
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American Academy of Sleep Medicine. Sleep Medicine Elective Toolkit: Parasomnias overview. AASM resource.
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