It's really silly, but I get annoyed with TV shows when their characters seemingly go days without much sleep and don't have any effects like looking tired or barely functioning. Especially supernatural shows where some of the characters are nocturnal and spend most of the night outside, get maybe a couple hours sleep then turn up at school fresh-faced and functional.
It's silly because it's a TV show so reality doesn't matter at all, but it's just a thing that always gets to me lol.