Ha! I get only 2-3 hours of sleep before work and I'm work 4am Logistics Backroom.
Really, really bad habit of mine. I usually get my 8-9 hours of sleep on my days off. My set schedule is work 5 days straight, then 2 days off. Been like that ever since I started Target (and thank god they never touch/change my availability)
I delivered newspapers one summer from 3am-6/8am. I would come home and sleep to about 3-4pm.
When I worked at Target and a TV station, I would wake at 3am. Work the TV station from 4am-1pm, work Target 3pm-8/10pm. Go home and crash, and do the same thing tomorrow.