The necessary duration of sleep varies from one person to another, the biological clock is different for everyone. Sleep time is 7 to 8 hours, but may vary for individuals to 4 hours of sleep and other 9 or 10 hours or more.
We all know people who only sleep 5 hours a night and spend their days without feeling any fatigue. Some people are exhausted when they have not slept 10 hours, hours they need to rest: "big" sleepers sleep cycles are longer.
Age
Babies
A baby: a baby needs 18 to 20 hours at the birth, followed by 14 to 15 hours at 1 year and 10 to 12 hours during his childhood.
teenager
A teenager needs 9 or 10 hours of sleep
adult
An adult of about 7 to 8 hours
older person
An elderly person needs less sleep
restorative sleep
The criteria for evaluating a number of hours of sleep is satisfying the following:
- Do not be tired and exhausted.
- Be careful.
- Succeed in concentrating.
- Lead a normal activity.
- Not aware of any period of drowsiness.
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