Hmmm, my work shifts are usually closing shifts, so I go to sleep usually around 1 or 2am.
Rarely it's 3 or 4am, if I can't sleep or if I don't work the next day.
For a time I had early shifts, and would sleep at 10/11pm, and wake up at like 7 or 8am.
I don't ever nap unless I'm sick. Don't have time for it, and also it stops me from sleeping at night.