Sexual behavior during sleep can end up in court
STUDY: Shapiro CM et al, Can J Psychiatry 2026
STUDY TYPE: Review
FUNDING: Independent
Background
Sexsomnia is a subtype of non-rapid eye movement (NREM) parasomnia, in the same family as sleepwalking and sleep eating. The affected person performs sexual behaviors during sleep, with no memory of the episode afterward.
This review is from the researchers who coined the term in 2003.
Summary
It’s common: lifetime prevalence of 7–10%.
It also carries legal risk: 41% of forensic sleep referrals involved allegations of sexual assault in 2019.
The most common triggers are physical contact with a bed partner (64%), stress (52%), fatigue (41%), and alcohol (15%). Alcohol increases deep (N3) sleep, which raises the risk of any parasomnia. Nearly half of affected individuals have another sleep disorder, such as sleep apnea. Medications including zolpidem, sodium oxybate, gabapentin, pregabalin, and trazodone have also triggered episodes.
Sexsomnia differs from sleep-related epilepsy (brief, stereotyped seizure movements) and REM behavior disorder (vivid dream-enactment, older adults, late-night timing). Malingering, dissociation, active mania or psychosis, and paraphilic disorders all preserve conscious awareness and must be ruled out.
Practice Implications
- If a patient or their partner reports unusual sexual behaviors at night, ask about amnesia for the episodes, other parasomnias, and the triggers listed above.
- When there’s any legal context, consult a medico-legal expert and get a bed partner interview.
—Chris Aiken, MD
Director, Psych Partners
Editor in Chief, Carlat Psychiatry Report
