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A human who can't sleep and stays up all night like a madman, then snoozes until noon like a lazy sloth. Usually kids or someone who thinks they're cool.
My sister stayed up until 3 a. m. watching TikTok and now she's sleeping like a baby at 11 a. m.
He texted me at 2 a. m. and then fell asleep during my math test.
My cousin stayed up all night eating pizza and now she's crying in her cereal bowl.