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According to Dr. Richard Ferber in his book "Solve Your Child's Sleep Problems," an 18-year-old requires 9 hours of sleep, though the typical range is 8.5-9.5 hours. This is from his chart on page 10.

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14y ago
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12y ago

Only 6 to 8 hours

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Q: How many hours of sleep does a 19 year old need to sleep?
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