I sleep when I'm tired. Usually either naked or half-naked (unless I'm really cold) with like 10 stuffed animals on my bunk and about 200 on top, and 3 blankets and several pillows. I usually listen to music. I solved the problem of light coming in through the window by hanging a quilt I made in high school from one of the bars on my bunk bed. Works wonders.

And I wake up when I have to pee.