I have been struggling with this since I went full-time with my venture a couple of months ago as well.  I have always had a chaotic sleep pattern, and the lack of a full-time job has just increased the irregularity.<p>Here's a thought, though-- is that so bad?  I find that I do my best, most creative thinking late at night.  It's always been like this for me.  Why fight it?  I'm trying to embrace the chaos now instead of trying to control it.