DozeClock › Sleep needs › 5 hours
Is 5 hours of sleep enough?
Updated October 3, 2026 · Sources: NSF panel 2015 · AASM 2016/2015 · CDC
Short answer (adults)
No
No — not recommended for adults. The adult range is 7–9 hours; 5 hours is 3 sleep cycles of 90 minutes.
General information from population studies (NIH, CDC, NSF, AASM). It is not medical advice and does not replace a clinician who knows you.
5 hours is outside the 7–9 hours the National Sleep Foundation panel recommends for adults aged 26–64, and misses the "7 or more" line from the AASM and Sleep Research Society. Whether it is enough depends on age: it is within the recommended range for no age group; it may be appropriate for some older adults; and it is not recommended for newborns, infants, toddlers, preschoolers, school-age childs, teenagers, young adults, adults.
Across the nine age groups, 5 hours is recommended for 0, may be appropriate for 1 and not recommended for 8. For an adult it is 2 hours under the seven-hour floor; over a working week that is 10 hours of missing sleep.
Dashed line: 5 h · dark bars: recommended · light: may be appropriate · NSF panel 2015 · as of October 3, 2026
5 hours by age group
| Age group | Recommended | 5 hours is… |
|---|---|---|
| Newborn (0-3 months) | 14–17 h | not recommended |
| Infant (4-11 months) | 12–15 h | not recommended |
| Toddler (1-2 years) | 11–14 h | not recommended |
| Preschooler (3-5 years) | 10–13 h | not recommended |
| School-age child (6-13 years) | 9–11 h | not recommended |
| Teenager (14-17 years) | 8–10 h | not recommended |
| Young adult (18-25 years) | 7–9 h | not recommended |
| Adult (26-64 years) | 7–9 h | not recommended |
| Older adult (65 years and over) | 7–8 h | outside, may be appropriate for some |
NSF panel (Hirshkowitz 2015) bands · as of October 3, 2026
What 5 hours means in cycles
At the 90-minute average, 5 hours is about 3 cycles (4 h 30 min). The cycles you lose on a short night are the last ones, which carry most of the night's REM sleep; deep sleep is front-loaded and mostly survives. See 3 cycles in detail →
One night versus every night
Both consensus statements are about a regular pattern. A single 5-hour night costs some alertness the next day and is paid back over the following nights; weeks of it are what the outcome studies on short sleep measured. If you are choosing a bedtime for tomorrow, the bedtime pages turn your alarm time into a cycle-aligned lights-out.
Sources
- National Sleep Foundation's sleep time duration recommendations: methodology and results summary — Sleep Health 1(1):40-43, 2015 (Hirshkowitz M. et al.)
- Recommended Amount of Sleep for Pediatric Populations: A Consensus Statement of the American Academy of Sleep Medicine — J Clin Sleep Med 12(6):785-786, 2016 (Paruthi S. et al.)
- Recommended Amount of Sleep for a Healthy Adult (AASM and Sleep Research Society consensus) — Sleep 38(6):843-844, 2015 (Watson N.F. et al.)
- How Much Sleep Do I Need? — Centers for Disease Control and Prevention (CDC)
General information from population studies (NIH, CDC, NSF, AASM). It is not medical advice and does not replace a clinician who knows you.