How long do you typically sleep at night?I usually try to get as much as I can, but, it's so varied that it's just too difficult to choose an appropriate time. During Uni terms I'm always staying up late studying/ tooling around even when I have to get up early morning. The way I cope with this is getting daytime napping down to a fine art. Because I live on campus, I can come home and nap between lectures, or straight after class. Most of the times my day is divided because of sleep and naps.
On holidays, I stay up really late every night and sleep as much as I can. Just now I slept for about 11 hours.
So.. hard to really say. I'm a quick adapter to sleeping habit changes.
Do you go to bed and wake up at the same time every day?Not at all. I don't think I could handle living on a schedule.
Do you enjoy sleeping?I love sleeping. Especially napping. I'm most happiest when I've just had a good lunch, and have the rest of the afternoon off, to lay down and have a nice doze. I dream often, so that too is something to look forward to a lot of the time when I wake.
Have you slept for that "15 hours or more" option before?I don't think I hit that mark quite often, my Flat is rather alive most of the time, it would be near impossible to get to 15 hours uninterrupted.

(Cool topic Kat!)