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The hangover like symptoms that are induced by copious amounts of sleep.

Symptoms include extreme grogginess, aches, and general crankiness after sleeping an extreme amount that you aren't used to. No illegal substances involved. Usually after 12+ hours of sleep.
Friend 1: "Jesus, we just slept 14 hours after that forensics trip."
Friend 2: "I know. I feel like I have been hit by a train."
Friend 1: "Damn sleepovers."
sleepover by alwayssixthirty April 11, 2010
An activity in which you become intoxicated and fall asleep in a semi unfamiliar surrounding. Be wary of having your asscheeks shlacked under some circumstances. (See shlack)
"Hey man, theyre really drunk, haha get the Plaster of Paris"
Sleepover by Ezrielli February 12, 2003
To spend the night with someone, usually you do not actually sleep. Then, you spend the rest of the day with them.
Hey, do you want to have a sleepover with me at my place?
Sleepover by Dimitrum June 27, 2018
Two members of the opposite sex make sweet love, and when the climax is reached the man ejaculates inside of the woman. He is to leaves his dick inside of the woman until he rocks up again. Like in a sleeping bag, he must be fully in character with that of one whom is at a “sleepover”
Okay so I was totally sleeping with this lady the other night and we totally had a “sleepover”
Dude you’re so lucky to have had a sleepover.

Oh I know.
What you tell your parents you’re going to do when you’re actually going to be pissed on some field and trowing your guts up from drinking too much WKD or Smirnoff.
Child: “Mum I’m off to a sleepover at Dan’s house, I’ll be back in the morning.”

Mum: “Ok, have fun.”

Child: *Smirks*
Sleepover by THICC SNACC March 27, 2019
When you ask your friend if they can spend the night at your house so you can have sex with them.
Wanna have a sleepover?
HELL YES said Brendan as he has dreamed of this for years.