Since you know when you need to get up, knowing the amount of sleep you need to function at your best can help you determine what time to go to bed.
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How much sleep is enough
To stay in good health, experts say adults should get seven to eight hours of sleep. Teenagers need nine to 10 hours, and school-aged children may need more than 10 hours of sleep a night.
Experts say the quality and quantity of sleep becomes poor as we age. This happens because brain circuits that control sleep slowly begin to weaken.
Experts say the process begins in our 30s. By the time we reach our 50s, the average person has lost 50% of their ability to have a restful sleep.
These people also have trouble falling asleep and staying asleep through the night. From middle age on, they say these problems only get worse, and they can affect our health.