Do you sleep with lights on or off???

I can sleep with both the light on or off. Actually I can sleep where ever and when ever. I do prefer to have the light off, since it is more comfortable for my eyes.

I usually don't turn my lights on at all, i work by the light of my various gizmo's. I tend to sleep during the day so turning on the lights would be plain silly~

off. i cant sleep in the light, unless its sunny and warm

I sleep with the lights off. The street lights from outside are always bright, so there's no winning in this situation, even through blinds and a curtain.

Lights off. I can't sleep properly when they're on.