I've written a few chapters about sleep, but this is different.
I suffer from the inability to sleep late. Always have. No matter when I go to sleep, I always wake up at seven. Every day. Always. For as long as I remember.
I also never have dreams. Just nightmares. I mean, it isn't too often, but whenever I have REM, it's always nightmares or just weird shit. Creepy weird shit.
But that's just me. I don't know if that's common, but I have no idea (tell me in the comments if it's the same for you). Sometimes, I don't get enough sleep for days at a time because I either stayed up till four and woke up at seven, or had a nightmare.