Sexual Behavior in Sleep

, “sleep sex” or “sexsomnia” or “SBS” 
is sexual behavior that occurs during sleep. Some people seem to enjoy it and view it with a sense of humor. However, it can be disturbing, annoying, embarrassing and is a potentially serious problem for some couples and individuals.

sleepsex Uncovered by Michael Mangan, Ph.D

SBS Publications – Sleepsex Uncovered

In Sleepsex: Uncovered (2001), Michael Mangan, Ph.D. sheds light on questions about sleepsex such as, “How many people ‘have’ sleepsex?” “What causes it?” “What can be done about it if it is a problem?” “What are the legal implications of sleepsex?” 

In plain language, the author summarizes what sleep experts have written on sleepsex, and provides a etailed and thoughtful analysis first-hand experiences of sleepsex.

Dr. Mangan’s analysis reveals what direct experience with sleepsex is like and how it affects those involved.

Your book will be of great value to the general public, patients, sleep medicine professionals, and to the legal profession. Nice job.” 

Mark Mahowald, M.D., Prof. of Neurology, University of Minnesota Medical School, Director of the Minnesota Regional Sleep Disorders Center.

“Thanks for sending me your book. I enjoyed reading it, especially because it includes so many first-hand accounts. The use of the Internet to collect data is original. I would interpret all of these accounts as sleep-wake dissociations akin to sleep walking, sleep talking, and nocturnal eating.” 

J. Allan Hobson, M.D.Prof. of Psychiatry, Harvard Medical School

Buy Sleepsex Uncovered on

"This week my fiance awoke me four times during the night. He put his hands down my panties and started stroking my vagina and my rectum. He groped my breasts. Both of these activities are things he normally would do during sex - the nature of the touching didn't seem out of character. I assumed he was making overtures and pushed him away. An hour or so later, it would start again. The third time, when I pushed him away he asked, "Am I bugging you?" The fourth time it happened I got out of bed and went to the couch. I was furious. I felt violated and like a piece of property. He is an intimate sleeper always but this has never happened before. He swears he has absolutely no recall. We have had some trust issues in the past so this is particularly difficult for me to believe. I did a reality check with some friends and they think it's sheer nonsense that he does not remember anything. However, when I went to your site I started to doubt their counsel and my own instincts. My fiance does have a history of sleepwalking and bedwetting as a child. He told me once that he made love to his first wife (20 years ago) and had no recall of the experience. He has also told me in the past that sometimes he wakes up and he is sleeping with his arm straight up in the air. I feel like I am going crazy. I was married to a compulsive liar and am terrified of making that mistake again. On the other hand, if he is telling the truth I feel horrid for falsely accusing him of lying. I am ready to end this relationship, which will be devastating for all of us. If you have any insight into this episode, I would very much appreciate it."
Danielle H. Baker
"I noticed your site on the internet off of a link from MSN.COM. Me and my fiance are experiencing a problem with sleep sex. Most nights that she falls asleep for a few hours she starts moaning and soon is masturbating and acting out sexual acts in her sleep. She has spoke to her doctor and he doesn't seem to think anything serious about it. She was put on an antipsychotic pill that only seemed to change the pattern for a couple weeks and then she went back to her usual sleep sex. She discontinued the pill at this point. If you can offer any suggestions or help it would be greatly appreciated."
Elsie Seay
"Me and my wife have been having a very difficult time since our marriage began four years ago. At night I become a very aggressive person in bed only to awake to a horrified wife that knows all to well what I have on my mind. It is only when she awakes that I realize what is going on. I do have a very difficult time at night sleeping. I get up every night. She has been so patient with me until recently the unwanted sex has become more aggressive. Our marriage is on the brink of divorce because of this obsession. She brought in an article that explains sleep sex! I read this and to my surprise I am astonished at what I was reading. I am looking a mirror image of what is happening to me. Is this just a convenient excuse for men with a sex obsession? If there is more information about sleep sex I would really like to know. I am in desperate need of answers to the question of what is going on."
Edith Cooper
“We are in a very awful dilemma. My husband has sleep sex. He had done this for years with his previous girlfriend. Anyway, his stepdaughter from the other woman claims that when she spent the night my husband was touching her inappropriately. When the police questioned him yesterday he had to admit to that problem that he has done all his life and he said he did not know if he had done anything to the girl. He hoped to god not. My husband is the greatest man and this thing doesn’t bother me when it is between us. We will be seeing an attorney. I know my husband and he would not do this. But he is scared if he did.”
Lucille Barnett

As early as 1996, (Shapiro, Fedoroff and Trajanovic, 1996) SBS was identified as a medical condition that may place one at risk of being accused of sexual assault. Thus, if a person is aware of their SBS and takes it seriously, this knowledge may carry with it some accountability for not taking actions to prevent sexual misconduct.

SBS is listed in the most current (revised) edition of the International Classification of Sleep Disorders (ICSD-2), which is the diagnostic manual used by sleep medicine practitioners to make diagnoses. Although it is recognized as a sub-type of parasomnia, “sexsomnia” is not included as a particular type of sleep disorder with its own diagnosis.

SBS is mentioned in the ICSD-2 and recent medical research suggests sexual behavior in sleep is a distinct form of sleep-related behavior in the class “parasomnia” (Shapiro et al, 1996; 2003; Schenck & Mahowald, 2005). Over the past five years information in the popular realm has become available (e.g., articles have appeared in CosmopolitanRedbookDetails, Newsweek). A Web search will yield a number of information sources. However, the community of legal and health professionals and the lay public remain largely “in the dark” when it comes to SBS and its clinical and forensic implcations. 

In fact, when one discovers their own SBS, usually after being informed about their behavior by a bed partner, they themselves are unlikely to believe that could behave in such a fashion. Often this is a source of conflict in couples as it is embarrassing to accept it as fact. Even when one reports another’s (that is, a person complains he/she has been fondled, etc., by a person who clearly appeared to be asleep), to a friend or health care provider in an attempt to try to get some support and to encourage their partner to treat his/her SBS, these persons cannot expect others to believe that they have experienced unwanted sexual contact initiated by a sleeping individual. 

At present most people know that people walk, talk and eat in their sleep. That sexual behavior also occurs in sleep is not, at present, common knowledge. With increasing media and academic interest in this phenomenon, this will likely change.

If you are experiencing problematic sexual behavior in sleep, find a sleep center and speak with a qualified sleep expert.


  • Schenck, C.H., Mahowald, M.W. (2005). Rapid eye movement and non-REM sleep parasomnias. Primary Psychiatry, 12(8), 67-74.
  • Shapiro, C.M., Fedoroff, J.P., & Trajanovic, N.N. (1996). Sexual behavior in sleep: A newly described parasomnia. Sleep Research, 25, 367.
  • Shapiro, C.M., Trajanovic, N.N., & Fedoroff, J.P. (2003) Sexsomnia: A new parasomnia? Canadian Journal of Psychiatry, 48(5), 311-317.

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