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3.
when you have to work early in the morning and still want to party, you get half your sleep before you go out and party.
Yesterday I got off at 4pm, went home and Pre-Sleep(Pre Slept) until 9pm, went and partied, back to sleep at 3 woke up at 6 and was at work at 630. I got 7 hrs of sleep.
by Dr. Berry August 31, 2008
 
1.
Falling asleep in front of the TV long before bedtime, usually the best quality sleep.
"Where's Chuck?"

"Oh, he's presleeping in front of the news again."

Similar to resleep (trying to fall back to sleep after being wakened unnecessarily). Also similar to desleep (being awakened unnecessarily).
by slevine November 03, 2007
 
2.
A late-night accidental nap in a chair or on a sofa, in which immediately upon waking up one goes to bed for the night.
I guess I dozed off into a pre-sleep while watching tv. I was really disoriented when I woke up from that, but then had like seven hours of amazing sleep.
by maxkeepsitreal1 October 04, 2013