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1.
to have sex with someone while they're still asleep or drowsy.
In the early morning I will suprise my boyfriend with sleeping sex. I slide on his erection just before he wakes up.
von Roxie 13. November 2003
 
2.
Somnophilia. A fetish in which a person fantasizes about having sex with somebody who is unconscious at the time.

This is different from necrophilia in that the object is still alive at the time of intercourse.
"Don't pass out in front of him."
"Why not?"
"Really into sleepysex, that one."
von the letter d 26. Oktober 2007
 
3.
what you give your woman using your morning glory
I woke at 4 am with a massive piss hard-on and slipped it into Nanci;she doesn't mind sleepy sex provided that you don't wake her up too much.
von Jake 5. März 2004