What’s the latest you’ve ever stayed up reading a book? Is staying up late reading a usual thing for you?

I've stayed up all night to finish a book. Two come to mind: Harry Potter and the Deathly Hollows and Eclipse. I was so into the books that I just kept on reading. Unfortunately, the day after reading Eclipse I still had to be at work and teaching by 8am. That was killer!

I am finding that my advancing age is cutting on the ability to stay up reading all night. Eventually my eyes tire out and I can't even see the words on the page. I try not to stay up too late reading. But it does happen sometimes.