I have begun to suspect I am naturally a night person whose been trying to live in a morning culture. The 8 hour at night pattern emerged with the industrial revolution. People often used to sleep four hours then do quiet stuff for a couple hours then go back to sleep. Where I'm going is to try not fighting it. Get up and do some quiet activities. No electronics or heart pulsing books. Chores or art or a hobby of some sort. Or just putz. Something where you can leave the lights low.