How Much Sleep Do You Really Need? A Guide by Age
“Eight hours” is the answer everyone knows, but it’s only roughly right, and only for adults. Your actual need depends heavily on your age, and a little on your genes.
The recommendations at a glance
| Age group | Recommended sleep |
|---|---|
| Newborn (0–3 months) | 14–17 hours |
| Infant (4–11 months) | 12–15 hours |
| Toddler (1–2 years) | 11–14 hours |
| Preschool (3–5 years) | 10–13 hours |
| School age (6–13 years) | 9–11 hours |
| Teen (14–17 years) | 8–10 hours |
| Adult (18–64 years) | 7–9 hours |
| Older adult (65+) | 7–8 hours |
These ranges come from the National Sleep Foundation’s expert consensus, and they’re ranges for a reason: a minority of people genuinely thrive at the bottom edge, while others need the top.
Why teens are a special case
Teen body clocks shift later: melatonin release starts around 11 PM rather than 9–10 PM. A teenager who can’t fall asleep before midnight isn’t being difficult; they’re following their biology. Combined with early school start times, this makes teens the most sleep-deprived age group. If that’s your household, weekend recovery sleep and consistent wake times help more than lectures.
How to tell if YOU are getting enough
Forget the number for a moment and check the signals:
- Do you need an alarm to wake up? Ideally you’d wake naturally near your alarm time.
- Do you crash in the afternoon? A mild dip is normal; needing a nap to function isn’t.
- Do you sleep 2+ hours longer on weekends? That’s repayment of sleep debt, not laziness.
- Do you fall asleep within 5 minutes of lying down? Sounds like a superpower; it’s actually a sign of sleep deprivation. Healthy onset is 10–20 minutes.
Quality matters as much as quantity
Eight fragmented hours can leave you feeling worse than seven solid ones. Two upgrades cost nothing:
- Consistency: same wake time every day, weekends included (within an hour).
- Cycle alignment: wake at the end of a 90-minute sleep cycle rather than the middle. Our sleep calculator does the math for you.
And if you snore loudly or wake unrefreshed no matter how long you sleep, take two minutes for the sleep apnea risk test. Poor quality sometimes has a medical cause that’s very treatable.