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
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
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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