At least you could actually still do an all-nighter. My last one (probably 15 years ago, now) was putting down a book I was reading at 4:30am, and having a power nap before getting up to go to work at 8. Nowadays, I have occasionally stayed up to around 3am, when I had too much caffeine the day before, but then I sleep until 11am. And the next night I'm in bed by 9. :-) Staying up all night AND the next day is well beyond my limits.