How Long Should I Nap?
Answer first: 20 minutes or 90 minutes, never in between. Find your ideal nap length and latest safe nap time.
Use How Long Should I Nap? ↓Nap Calculator
Find your optimal nap window and the latest safe time to nap without disrupting tonight's sleep.
Your Nap Plan
The Short Answer
Nap for 20 minutes or 90 minutes — almost never anything between. Twenty minutes keeps you in light sleep, so you wake refreshed. Ninety completes one full cycle, so you wake at a natural boundary. The 30–60 minute middle zone drops you into deep sleep and then wakes you from it, which is the biological definition of waking up on the wrong side of bed.
The Two Good Naps, and What They're For
The 20-minute power nap restores alertness and mood and suits most workdays; set an alarm for 25–30 minutes to allow for falling asleep. The 90-minute full-cycle nap includes deep sleep and REM, genuinely repays sleep debt, and earns its keep after a terrible night or before a long evening — but it costs more night-time sleep pressure, so keep it early.
Timing Beats Length
The same nap taken at 2pm and 6pm are different interventions. Late naps drain the adenosine pressure your night sleep runs on — finish any nap 6–7 hours before bedtime. The calculator above works out your personal latest-safe-nap time from your bedtime.
Frequently Asked Questions
Why do I feel worse after a 45-minute nap?
At 30-60 minutes you are waking from deep sleep mid-cycle, which triggers sleep inertia: grogginess that can outlast the nap's benefit. Nap 20 minutes (wake before deep sleep) or 90 (complete the cycle).
What is the latest time I should nap?
Finish naps at least 6-7 hours before bedtime, which for an 11pm bedtime means ending by about 4pm. Later naps drain the sleep pressure your night sleep depends on.
Is a 2-hour nap too long?
For most adults yes: it usually runs past one full cycle into a second, ends mid-deep-sleep, and eats heavily into night-time sleep pressure. Regularly needing 2-hour naps is worth reading our sleep debt guide.
Do coffee naps work?
Yes, surprisingly well. Caffeine takes about 20 minutes to absorb, so drinking a coffee immediately before a 20-minute nap means you wake just as it kicks in, clearing adenosine and adding the caffeine boost on top.
Should I nap at all if I have insomnia?
Usually no. Insomnia treatment relies on building maximum sleep pressure by bedtime, and any daytime nap spends some of it. Protect nights first; add naps back once nights are solid.