I probably slept the most when I was in college, though for some time I would stay awake for 24 hours, then sleep for 12, repeat. Worked great for getting things done, but sucked for any set schedule.

I didn't continue that in the "real" world, but noted that waking up at 10am and getting to work at 11 worked well and I would keep that schedule on weekends as well. Due to pressure from management, I shifted to coming in earlier. My work suffered, but as long as I was there by 8:30 my boss' didn't care.

Now, I wake up at 5:15 am to avoid the traffic, but wind up leaving work at 4 pm. (My last job, I did the same wake up, but didn't leave until 8pm.) I can't get to sleep until at least 11. On weekends, I tend to sleep lots.

Since I've had the last couple weeks off, I've screwed my schedule horribly. Up at 1pm central time, walk down to Cafe Du Monde', have the required snack, wander the french quarter, take a nap, walk around some more, meet people at midnight at Cafe Du Monde', wander, sleep, repeat.