Compléter 208-testVersion en ligne 208-test par Farhad Key 1 identify impairs quantity immune important factors as patterns most important drowsy The amount of sleep you need depends on many , especially your age . Newborns sleep between 16 and 18 hours a day and preschool children should sleep between 10 and 12 hours . Older children and teens need at least nine hours to be well rested . For adults , seven to eight hours a night appears to the best amount of sleep . However , for some people , " enough sleep " may be few as five hours or as many as 10 hours of sleep . As you get older , your sleeping change_ Older adults tend to sleep more lightly and awaken more frequently in the night than younger adults . This can have many causes including medical conditions and medications used to treat them . But there's no evidence that older adults need less sleep than younger adults . Getting enough sleep is to your health because it boosts your system , which makes your body better able to fight disease . Sleep is necessary for your nervous system to work properly . Too little sleep makes you and unable to concentrate . It also memory and physical performance . So how many hours of sleep are enough for you ? Experts say that if you feel drowsy during the day ? even during boring activities ? you are not getting enough sleep . Also , quality of sleep is just as as . People whose sleep is frequently interrupted or cut short are not getting quality sleep . If you experience frequent daytime sleepiness , even after increasing the amount of quality sleep you get , talk to your doctor . He or she may be able to the cause of sleep problems and offer advice on how to get a better night's sleep .
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