Early morning freak
A person who can't sleep and stays up all night, then sleeps like a monster during the day. Usually a teenager or someone with no brains.
My cousin stayed up all night watching videos and now she's sleeping like a baby at 11 a. m.
He texted me at 3 a. m. and then fell asleep during my math test.
My friend couldn't sleep because of his dumb phone and now he's snoring at 10 a. m.