Top Definition
Involuntary sexual behavior during sleep, which can involve penetration.
"She thought that I was trying to rape her, but I explained that I suffer from sexsomnia."
by AC Stunna a.k.a COLE December 04, 2005

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Sexsomnia aka Sleep Sex is a parasomnia (sleep disorder) that causes a person to engage in sexual relations while asleep with no memory of the event.
Sexsomniac: I woke this morning feeling tired and found used condoms in my house. How is this possible, I do not recall having sex and I was alone last night when I went to sleep?

Doctor: Sounds like you may have Sexsomnia. Let's get you into a sleep clinic for further review.

Type sexsomniacs journey for more information about Sexsomnia.
by Sexsomniacs November 15, 2012

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The act of when you have sex in your sleep.
My boyfriend totally had sex somnia last night.
by dehydrated slutbag November 10, 2011

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