On average, infants sleep 20 hours a day, 1-year-olds sleep 13 hours a day, teenagers sleep 9 hours, 40-year-olds sleep 7 hours, 50 year-olds sleep 6 hours, and people 65 and older sleep 5 hours. As you get older, you spend more time lying awake at night and, once asleep, you’re much more easily aroused. [...]
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