8 hours should be enough 

Its so sad...i guess today people sleep not so much 5-7 hours...work, study and other stuff...i wish i could sleep for 10 hours every day...

@cody976 I only sleep 6 hours in weekdays.You have a much healthier lifestyle..I have to stay up tonight because I didn't do my school assignment until tonight.And yeah I can not imagine how I will feel tomorrow.I know I deserve it..:(

I generally sleep for 7-8 hours a night. I think it would be a very long day if I only got 4 hours of sleep. Why do you get so little sleep?