During the summer, I slept all day and stayed up all night. Mainly because my friends did but during school I don't stay up past anything but 1 am. Staying up late isn't as great as you think it is though, if you pull an all nighter two times in a row it can really mess up your sleeping schedule, it will make you tired as hell if you have to go to school in the morning and you wont be able to go to sleep at night.