[monk_e_boy]

Naps! Seriously, if you're lying in bed and can't sleep .... you're not sleepy. Get up, do something. (Listen to your body)

Hell, I can go a few days on 2 hours sleep, then sleep like, 8 hours or 12 hours. Or I'll sleep 5 hours (from 5pm to 10pm) then sleep maybe from 4am to 7am ...

There's plenty of chores to do, or a bit of DIY or watching tv...

Get a diary. Write the stuff in there. Next time you wake up, tell your brain, thank you for reminding me, but we already wrote this down - look. And read it aloud. Eventually your brain will get it and stop waking you up (you should read The Chimp Paradox -- about how your brain works)