I stayed up until 3 AM reading a book.
It was in no way a good book, and no, there was no rush to return it to a library or anything like that.
From about 12:30 on, I was shaking my head at myself, fully aware that this was not a good idea.
Around 2 AM I did the mental math, cringing as I realized how soon my alarm was going off.
I used to have sense and impulse control and a healthy override switch to go to bed when I was tired.
Or maybe I never did...when books were involved.