😴 How Much Sleep Do You Need by Age?

Sleep need is not one-size-fits-all. A newborn needs more than twice the sleep of an adult, and a teenager needs meaningfully more than their parents. The National Sleep Foundation published age-specific, evidence-based sleep recommendations in 2015, and in 2026 a 10-year review of 133 meta-analyses reaffirmed them — a decade of new science continues to support the original numbers. Here is what they say, in plain language.

The full chart: recommended sleep by age

• Newborns (0–3 months): 14–17 hours
• Infants (4–11 months): 12–15 hours
• Toddlers (1–2 years): 11–14 hours
• Preschoolers (3–5 years): 10–13 hours
• School-age children (6–13 years): 9–11 hours
• Teenagers (14–17 years): 8–10 hours
• Young adults (18–25 years): 7–9 hours
• Adults (26–64 years): 7–9 hours
• Older adults (65+ years): 7–8 hours

These ranges describe healthy people with normal sleep. The foundation also notes that slightly shorter or longer durations can be acceptable for individuals — but habitually sleeping far outside your range is rare and may signal a health problem worth discussing with a doctor.

Why sleep needs change with age

Children's brains and bodies are doing construction work. Deep sleep drives the release of growth hormone, and the brain is forming and pruning neural connections at a furious pace — that is why babies sleep through most of the day and toddlers still need naps. As growth slows, total need falls.

Teenagers are the surprise: they need 8–10 hours even though they look fully grown, because their brains are still rewiring and their internal body clock naturally shifts later, making them want to stay up at night and sleep in. This is biological, not laziness — which is why early school start times fight teenagers' sleep biology.

Adults settle at 7–9 hours. As we age past 65, sleep gets lighter and more fragmented, so the recommendation dips slightly to 7–8 hours. Older adults often spend the same time in bed but sleep less efficiently — and chasing extra hours in bed can actually make insomnia worse.

What the ranges actually mean

The recommended range is the sweet spot, not a pass-fail line. Landing at the low end of your range and feeling alert all day is fine; landing at the low end and needing three coffees to function is not. The right number for you is the one where you wake up refreshed, stay reasonably alert through the afternoon, and fall asleep within about 20 minutes at night. If you habitually sleep outside your range and feel bad, that is worth a conversation with a doctor rather than a tougher alarm.

Turn your target into a bedtime: a worked example

Take a 34-year-old who wakes up at 6:30 AM. The adult range is 7–9 hours, so count backwards: 9.5 hours before 6:30 AM is 9:00 PM, 7.5 hours before is 11:00 PM. Their target bedtime window is 9:00–11:00 PM, since it takes roughly 15–30 minutes to fall asleep. Want to wake up feeling refreshed instead of groggy? Sleep runs in roughly 90-minute cycles, so aim for a bedtime that lands you at a cycle boundary — our free Sleep Calculator works out the exact times from your wake-up hour automatically.

Hours are not everything: sleep quality counts too

Eight hours of restless, phone-lit sleep loses to seven hours of deep, uninterrupted sleep. Three habits matter most: keep a consistent schedule (even on weekends — your body cannot tell Saturday from Monday), get morning daylight within an hour of waking to anchor your body clock, and cut caffeine after early afternoon — it stays in your system far longer than it feels like. Screens in bed delay sleep onset for almost everyone, so move the phone charger out of arm's reach if you can.

How to use this chart

Find your age group above, pick the middle of the range as your starting target, and run it for two weeks. Adjust up if you are drowsy at 3 PM or falling asleep the moment you sit down, and adjust down if you are wide awake in bed after 20–30 minutes most nights. Then plug your target into the Sleep Calculator with your wake-up time and let it find your best bedtimes — small changes to bedtime beat heroic changes to wake time, because your wake time is usually fixed.