Older men have elongated ball sacks (scrotums) that may block their anal blowholes when they lay on their backs. Thus a flapping sound is reverberated whenever a fart tries to pass the ballsack.
The sound that was perfected by Schemp of the Three Stooges while he acted like he was asleep...it has long neen debated that Moe was actually a sleep sacknia sufferer...until his passing.
by Ranger0n September 24, 2011

1. When, in class you are taking notes, but becoming increasingly tired. You end up falling asleep several times, but are still trying to take notes. Next thing you know, class is over and what you look down at are your sleep notes. They start with the correct information, and steadily become more illegible and harder to understand. They will often incorporate small dreams you had, or you will accidentally write what people near you are saying, instead of what the teacher is saying. They may include doodles and scribbles that even you cannot decipher.
Ring!
Teacher: Alright everyone, have a good weekend!
John: Oh man, class is over?
Steve: Yeah, you slept through the entire thing.
John: Oh man, check out these sleep notes! I started with a timeline about the colonization of America that turned into a scene out of Family Guy, and then I see what looks like a smiley face, with lines trailing off of it.
Teacher: Alright everyone, have a good weekend!
John: Oh man, class is over?
Steve: Yeah, you slept through the entire thing.
John: Oh man, check out these sleep notes! I started with a timeline about the colonization of America that turned into a scene out of Family Guy, and then I see what looks like a smiley face, with lines trailing off of it.
by pearljammers December 2, 2009

The instinctual desire of your body to sleep above any other activity. This is recognised most easily when lying next to a horny, ambitious and less sleepy partner. However, it is sometimes experienced among bored master-baters and in this case, it's time to rethink one's life.
by J Mango July 5, 2016

A day where you can sleep without fearing to not wake up for school. It's a great day cause no stress or multiple alarms.
Jason: "Tomorrow's Saturday so it's a safe sleep day."
Alan: "WOOH YEAH BABY!"
Random: "What's a safe sleep day?"
Jason & Alan: "How the hell do you not know."
Alan: "WOOH YEAH BABY!"
Random: "What's a safe sleep day?"
Jason & Alan: "How the hell do you not know."
by Bossiermeteor January 2, 2022

I was fighting my girlfriend for the covers, but I couldn't hold on because of my sleep gripnea, and she won.
by mattdc January 10, 2014

man1:"hey man im wrecked as i been trying to go to bed for hours i just cant fall asleep"
man2:"just have a sleeping pull"
man1:"oh yea true, alright night man"
man2:"just have a sleeping pull"
man1:"oh yea true, alright night man"
by karisma October 23, 2006

When you have nothing really important to do, so you temporarily shut down your brain and daydream, a bit like a computer.
Brian: What's wrong?
Zach: Ugh, Will was totally in sleep mode during my presentation. IT WAS IMPORTANT!
Brian: LOL.
Zach: Shut up, you dick.
Zach: Ugh, Will was totally in sleep mode during my presentation. IT WAS IMPORTANT!
Brian: LOL.
Zach: Shut up, you dick.
by definebird August 8, 2017
