Sleep is a naturally recurring state characterized by reduced or absent consciousness, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles.

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Should I get 7h of sleep or as much as I need (namely 12h)?

I remember a study that showed that people who get less or more than 7h of sleep die sooner (the larger the deviation, the sooner they die). However, I don't think this study normalized against ...
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Optimized sleep schedule and how important is it ?

I am asking myself, how does an optimized sleep schedule for a good fitness life look like. What is so "optimized" and how important the sleep schedule is?