Is a 60-minute nap good? What happens when you wake up
Updated October 3, 2026 · Sources: NASA 1995 · Brooks & Lack 2006 · Tassi & Muzet 2000 · NINDS
Short answer
60 min
reaches deep sleep (N3) · grogginess on waking: high. Set the alarm for 75 minutes after you lie down to allow for falling asleep.
General information from population studies (NIH, CDC, NSF, AASM). It is not medical advice and does not replace a clinician who knows you.
A 60-minute nap normally reaches deep sleep (N3). An hour usually ends inside deep sleep; expect grogginess on waking unless you extend to a full cycle. Expect high grogginess on waking.
Sleep inertia ratings from Brooks & Lack 2006, Tassi & Muzet 2000, Rosekind 1995 · as of October 3, 2026
Why 60 minutes behaves this way
At this length you are likely inside deep sleep when the alarm goes, so plan for 10–30 minutes of sleep inertia before you are sharp — not a good choice before driving or a meeting. If you have the time, a full 90 minutes lands you in light sleep or REM instead.
Every nap length
| Nap | Reaches | Grogginess | Set aside |
|---|---|---|---|
| 10 min | light sleep (N1-N2) | minimal | 25 min |
| 20 min | light sleep (N2) | low | 35 min |
| 26 min | light sleep, occasionally early deep sleep | low to moderate | 41 min |
| 30 min | often enters deep sleep (N3) | moderate | 45 min |
| 45 min | deep sleep (N3) likely | moderate to high | 60 min |
| 60 min | deep sleep (N3) | high | 75 min |
| 90 min | complete cycle including REM | low (waking near the end of a cycle) | 105 min |
15 minutes added for sleep onset · sources above · as of October 3, 2026
Sources
- A brief afternoon nap following nocturnal sleep restriction: which nap duration is most recuperative? — Sleep 29(6):831-840, 2006 (Brooks A., Lack L.)
- Alertness Management: Strategic Naps in Operational Settings — NASA Technical Memorandum 108839 (Rosekind M.R. et al.), 1995; also J Sleep Res 4(S2):62-66
- Sleep inertia — Sleep Medicine Reviews 4(4):341-353, 2000 (Tassi P., Muzet A.)
- Brain Basics: Understanding Sleep — NINDS (NIH)
General information from population studies (NIH, CDC, NSF, AASM). It is not medical advice and does not replace a clinician who knows you.