Well.. Some might say, that it's not enough, but I sleep like 5 - 5.5 hours a day.. And done it for 8 years now..
The advice of many people is correct. How many hours of sleep a day depends on your age, but 5 - 5.5 hours is very little. Minimum 7 hours a day to have energy and spirit for the new day.
Yea, i know that. I've got my energy through physical exercises. I'm doing 1h 30m every morning, more or less, and with healthy food that gives me energy.