Did You Know Over Sleeping Can Lead To Death?

How much sleep is needed? We have no idea of the actual amount, scientists on the other have a sound suggestion. They recommend a night sleep from 7 to 9 hours.
Lets's dig a little bit deeper and know the reasons about why we should avoid?

Oversleep are prone to depression.
Oversleeping is a blunt brain.
 Messes with your heart.
 Leads to diabetes.
 You sleep a lot ? you are probably obsess then.
 Death approaches.