我该睡多久 不同年龄 婴儿 成人 老人 | how much sleep do I need by age infant adult senior
How Much Sleep Do You Need?
Sleep needs change dramatically from infancy to old age. Type your age and get your recommended window — plus what it means in 90-minute sleep cycles.
| Age group | Recommended | Notes |
|---|---|---|
| 0–3 months | 14–17 | Naps all day — no fixed schedule yet |
| 4–11 months | 12–15 | 2–3 naps; earliest bedtime 6–7 p.m. |
| 1–2 years | 11–14 | One nap around midday is enough |
| 3–5 years | 10–13 | Naps should end before 4 p.m. |
| 6–13 years | 9–11 | School nights: protect the earliest hour of sleep |
| 14–17 years | 8–10 | Body clock drifts late — earlier school times fight biology |
| 18–64 years | 7–9 | 7.5 h = 5 full 90-minute cycles |
| 65+ years | 7–8 | Sleep gets lighter and more fragmented — naps help |
Where these numbers come from
The ranges above follow the National Sleep Foundation consensus (Hirshkowitz 2015, Sleep Health), the most widely cited standard. Panels of 18 sleep scientists reviewed 300+ studies to set each band, with the "recommended" middle and wider "may be appropriate" edges.
Three things move you inside your range: sleep debt (if you catch up 2+ hours on weekends, aim for the top), genetics (rare short-sleeper mutations let some adults thrive on 6 hours — most people who claim this are just chronically tired), and quality (fragmented sleep raises your need). A practical test: if you wake without an alarm feeling restored, you have found your number.
📖 Related reading: How Much Sleep Do You Need? (Full Guide) · Teen Sleep Calculator · Sleep Debt Calculator
Frequently asked questions
Is 6 hours of sleep enough?
For the vast majority of adults, no — 6 hours leaves measurable deficits in attention and reaction time within a week (Van Dongen 2003). Genuinely short sleepers with the DEC2 mutation are estimated at under 1% of the population.
Do older adults need less sleep?
Only slightly — 7–8 hours versus 7–9. Sleep in later life becomes lighter and more fragmented, which often pushes older adults to bed earlier and wake earlier. Total need barely changes; the ability to get it in one block does.
Why do teenagers sleep so late?
During puberty the circadian clock shifts up to 2 hours later — melatonin release comes later at night. Early school start times collide with this biology, which is why teens average chronic sleep debt.
Disclaimer: Recommended ranges are general guidelines, not medical advice. Individual needs vary; consult a professional about persistent sleep problems.
References
- Li, J., et al. (2018). Sleep duration and health outcomes: an umbrella review. Sleep Medicine Reviews, 40, 135–150.
- Hirshkowitz, M., et al. (2015). National Sleep Foundation's sleep time duration recommendations: methodology and results summary. Sleep Health, 1(1), 40–43.
- Centers for Disease Control and Prevention. (2022). How Much Sleep Do I Need? cdc.gov.