I saw a documentary about sleep a few years ago. The main idea was that a sleep cycle lasts approximately 90 minutes, and you feel better rested when you avoid

I saw a documentary about sleep a few years ago. The main idea was that a sleep cycle lasts approximately 90 minutes, and you feel better rested when you avoid waking up in the middle of a cycle. Since then, I always set my alarm clock to sleep a multiple of 90 minutes: 6h, 7h30min, 9h... (6 hours more often than not, but I might change this, having read this article...) I used to dream all the time. I haven't dreamt since I started doing this. I guess I still have dreams, but I never remember them. I think you only remember dreams when you are woken up in the middle of REM sleep (in the middle of a cycle). A nice benefit of my current sleep pattern, is that I fall asleep very fast, instead of waiting in bed for up to 1 hour like I used to. I hope it's not because I'm sleep deprived, though...