Sleep at a regular time, and wake up at a regular time. Have a pattern to your day where you do things at regular times.

This does help immensely. After I finally figured out my sleep disorder, I was able to adjust for it, and suddenly both my mood and my health improved dramatically. (Of course, for me, that was a shift from suicidally depressed to melancholy and bored but it's still a huge improvement and just remembering the relative difference has a tendency to mildly cheer me further.)

I'd go on but my problems are different enough from chimera's that they're not relevant to this thread.