Why do some people need more sleep than others?
Quick Answer
Sleep need varies because of age, genetics, health, and daily demands on the brain and body. Most adults need about 7 to 9 hours a night, but some people naturally function well on slightly less or slightly more.
The Full Story
Sleep requirements are not identical for everyone. Genetics influences circadian timing, sleep depth, and how much sleep a person needs to feel alert. Age is also important: infants and teenagers generally need more sleep than adults, while older adults may sleep more lightly or wake more often. Illness, stress, medications, and physical activity can all change sleep need as well. For most healthy adults, the commonly recommended range is 7 to 9 hours per night, but individual variation is normal.
Key Facts
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"Why does one person wake up refreshed after 6 hours while another needs 9?"
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