Right now I can sleep anytime I want, but my body still wants to keep going late. I've tried adjusting it to so-called "normal" hours, but it doesn't matter how many hours of sleep I get, I'm just useless in the morning hours. If I'm doing something exciting, I find that I only sleep three or 4.5 hours at a time (two to three sleep cycles), combining two of these throughout the day. Even now, it's only about six hours every night (3am to 9am last night). Seems to be about all I need.
I'm not sure I could handle having to work only eight hours every day! I'd be far better off (and way more productive) if I worked 16 hours then had a day off. Once I get going and into the "zone" I don't want to stop (and my back suffers because I forget to get up and stretch often enough). Oh well...