[wheaties]

You need to find something to occupy your time. Even if only a pet programming project. Something you force yourself to do for 2-4 hours every day non-stop as if you were at work. You'd be surprised how your body and mind relax into a "normal" schedule once you've got that "I'm done with work" feeling.

[smokinn]

That's completely untrue. I'm the same as the gp. When I don't have a rigid schedule I absolutely have to follow (whenever I'm unemployed or when I was in school) I drift around the clock. It's much more natural for me and I feel much more rested than when I'm on a fixed schedule.

[gte910h]

Most people have this issue, some to a larger degree than others, if they don't give themselves strong light cues.