albert einstein slept 4 hours a night. Let me tell you one thing, its a myth that you need 8 hours of sleep. I know a lot of people that sleep more then 8 hours and they feel tired all the time. Its all mental, lets say for an example you feel tired right now, and all of a sudden you have 100 000 dollars in the palm of your hand, would you still feel tired? Dont think so, its allmental, your spirit is tired, and the body listens to your spirit. Snap out of it son, learn some mental knowledge.