How much sleep do you need?

[Farsala]

A ton. But a lot of it is stress induced with a lack of routine. If I got a paper to do, its unfeasible to sleep at the correct time, if I got an exam tomorrow (in fact I do...) then I lose some sleep doing homework and making sure my studies are up to date. So after a day like that, even with 8 hours of sleep, I usually fall asleep again for 2-3 hours after classes. On sundays after 2 full nights of sleep I usually only need 6-7 hours.

Obviously depends on the day thus an average is needed so I suppose 9.5 hours.