Staying awake very late just to finish a book.
It's awesome to just read on, without paying attention to clocks or any other silly things, finishing books is satisfying, books often "taste" best when consumed in large chunks and the gradually increasing light is just beautiful.
But a habit like this really doesn't make your life easier if a) you have to wake up early (11am
) next morning, b) if it makes you get up outrageously late (2.30pm) if you don't have to wake up early, c) you've done it on three subsequent nights and fear it's becoming a habit and c) it is combined with playing a werewolf game the deadline of which is 2am your time.