Sleep is an issue for me, too. When depressed, I can sleep for 12 hours or more at a stretch. When I'm feeling better (like now) I keep waking up after 3-4 hours sleep. I don't worry much about mania unless I don't sleep at all for a few days, but it is frustratiing waking up at 3:00 in the morning & not being able to get back to sleep. I take two benzos (temazepam & klonopin) before bed, which should knock me out, but they don't do the job. It seems I'm never able to sleep an optimal 6-8 hours a night. I don't know that I'd call sleep an enemy, or that it causes undo anxiety, I just wish I could get a "normal" night's sleep.