The length of your nap determines what you get out of it. A 20-minute nap boosts alertness. A 90-minute nap boosts creativity. A 60-minute nap makes you feel terrible. Here's what each nap length does and which one to choose.
Best for: Alertness, quick energy boost, midday recharge
You stay in light sleep (Stage 1-2), which improves alertness, mood, and motor performance. You wake up within minutes feeling refreshed. This is the safest and most reliable nap length.
When to use: Before a meeting, during a lunch break, when you need a quick pick-me-up. Works any time before 3 PM.
Best for: Nothing. Avoid this length.
A 60-minute nap enters deep sleep (Stage 3) but doesn't complete a full cycle. You wake up mid-deep sleep, which causes severe sleep inertia (grogginess, disorientation) that can last 30-60 minutes. You'll feel worse than before the nap.
Best for: Memory, creativity, physical recovery, emotional processing
A 90-minute nap completes one full sleep cycle: light sleep → deep sleep → REM sleep. You wake up at the end of a cycle, so there's minimal grogginess. Deep sleep provides physical restoration, and REM sleep provides memory consolidation and creative insight.
When to use: After a very short night, after intense exercise, when you need creative problem-solving. Best taken before 2 PM.
Better than nothing. Even closing your eyes for 5 minutes can reduce fatigue and improve alertness. A study in Clinical Neurophysiology found that a 5-minute nap improved alertness, though less than a 10-minute nap.
Two full cycles. Good for severe sleep deprivation, but you'll experience some grogginess upon waking (waking from the start of a third cycle). Only use when you're extremely sleep-deprived and have time to recover from the grogginess.
Calculate your perfect nap length with our free Nap Calculator.
Because 30 minutes is long enough to enter deep sleep but not long enough to complete a cycle. You wake up during the deepest part of sleep, which causes severe grogginess. Stick to 20 minutes or extend to 90.
It's risky. 45 minutes puts you deep into Stage 3 sleep. You'll likely wake up groggy. If you can't commit to 90 minutes, stick with 20.
Great. A 10-minute nap provides most of the alertness benefits of a 20-minute nap with even less risk of grogginess. If you have trouble waking up from 20-minute naps, try 10.