Sleep needs change dramatically across the lifespan. The CDC and NIH publish age-banded recommendations based on decades of research. Here are the numbers and the reasoning behind them.
Newborns 14–17 hours, infants 12–15, toddlers 11–14, preschool 10–13, school-age 9–11, teens 8–10, adults 7–9, seniors 7–8. Ranges, not single numbers, because individual variation is real.
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