I don't anymore, but when I first started my job (and was too nervous to say "no") i would pull doubles and pick up days. Once, I worked 16 days in a row, most of them I was working double shifts(16 hours). Another time (and the last time I worked a double), I worked from 2:30pm to 7:30am, went home and showered, then had to go back to work for a 2 hour meeting...back home after that for a quick nap and food, then went back in at 2:30pm until 11pm. I was dead tired.

Frankly, I'm getting too old for those kinds of hours (which is sad to admit, because I'm only 29). Sleep is my precious!