I also run a fan constantly when i sleep. i find if i'm visiting family, or staying in a hotel, if i dont have a fan in the room i cant sleep. Its too quite. The only light in my room at night would be the light coming from my digital clock, but it kinda sits on a shelf behind me, it doesnt effect me at all. As far as waking up on a "schedule" it doesnt happen for me. its all over the place. sometimes i'll wake up after 20min, then fall back asleep for an hour, then wake back up 35 min later then back to sleep for an 1h20m its really crazy....