Sleep is NOT overrated.
Sleep helps maintain good health in a MAJOR way.
7-8hrs of sleep is healthy for the average person 18-30 yrs old.
Ironically, the older you get, the less sleep your body requires.
I don't function well with less than 7 hours of sleep. Come mid day, I'm dead and ready for bed.
With 8 hours, I'm at optimum performance.
More than 8 hours usually makes me droggy.
Sleeping too much isn't good for you.
Like anything good, do it in moderation.