My sleep is always messed up. I can go for days with no sleep, or very little. And then I have times where I can sleep 15+ hours. And I wake up at least 5 times a night (I just started taking melatonin and that has been helping with waking). Sometimes I wake up every 20 minutes for hours, and it's the most tormenting sleep. Nightmares, hypnagogic hallucinations (which I've learned to control and usually enjoy--I call them "visions" bc people speak to me). Right now I'm going on 1 hour and feel so energized. I guess I've been on the higher side though, so it makes sense.