Do you sleep with the light(s) on or off?

Everything off. Blinds closed. Any source of light or reflection or shine disattracts me somehow. Even if it's my belt. Luckily my alarm only gives light when going off or when you press a button. For sound it's pretty much the same thing. Any sound catches my focus and makes it harder to fall asleep. Too bad there are almost always lights on somewhere when I want to sleep.

Funny thing is that when I'm camping I can sleep under all circumstances.