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Most 30-year-olds feel and function best with 7–9 hours of sleep each night, with at least 7 solid hours as a baseline goal.

Most 17-month-olds sleep around 11 to 14 hours in 24 hours, usually 10 to 12 hours at night plus 1 to 3 hours of daytime naps.

Most 14-year-old boys need 8 to 10 hours of sleep each night to stay healthy, learn well, and keep mood and energy steady.

A 15-year-old girl should sleep about 8–10 hours each night to stay healthy, think clearly, and keep mood and growth on track.

Most 13-year-olds need 8 to 10 hours of sleep each night, with a steady bedtime and wake time to stay alert, healthy, and ready to learn.

A typical 12-year-old should sleep 9 to 12 hours each night so the brain, mood, and body can handle school, growth, and daily demands.

Most 19-month-olds need about 11–14 total hours of sleep each day, including nighttime sleep and one daytime nap.

Most 10-month-old babies do well with about 13 to 15 hours of total sleep in 24 hours, including nighttime sleep and two daytime naps.

Most 8-month-old babies need around 12 to 16 hours of total sleep each day, including naps, though every baby’s pattern stays a little different.

Most 2.5-year-olds need about 11–14 hours of total sleep in 24 hours, including one long nap.