Since last year I lost all control over my sleeping schedule, I sleep whenever I'm sleepy which might be any time someday I'll be sleeping around 22:00 other day I'll be sleeping around 8:00 anyway I often sleep 7 to 8 hours.
I sleep on the floor because it's closer to my computer than my bed. Sometimes when I'm feeling really lazy I don't even get on the floor, just lean back in my computer chair and fall asleep.