☀️ Nap Calculator
Find the perfect nap length — boost energy without waking up groggy
Or pick a nap type:
Why nap length matters so much
The wrong nap length can leave you feeling worse than before. Here's what happens in your brain at each stage:
⚡ 10–20 min — Power nap
Only light sleep (Stage 1–2). Your brain clears adenosine (the sleepiness chemical). You wake up sharp. Used by NASA pilots and surgeons before long procedures.
⚠️ 30–60 min — Danger zone
You enter deep sleep (Stage 3) but don't complete a cycle. Waking here causes sleep inertia — that horrible groggy feeling that can last 30–60 minutes.
🌟 90 min — Full cycle
One complete cycle including REM sleep. Memory consolidation, creativity boost, emotional reset. You wake naturally at cycle end — refreshed, not foggy.
💤 20 min + caffeine = Super nap
Drink coffee immediately before a 20-min nap. Caffeine takes ~20 min to kick in — so it activates exactly when you wake up. Double energy boost.
Who should nap?
Napping isn't just for toddlers. Research shows strategic napping improves performance across all age groups:
👩💻 Office workers
A 20-min nap improves alertness by 54% and performance by 34% (NASA study). Better than a 3rd coffee.
🎓 Students
90-min nap after studying boosts memory retention. The REM sleep during the nap consolidates what you just learned.
🏋️ Athletes
Napping before competition improves sprint speed, reaction time, and mood. Used routinely by elite sports teams.
🚗 Night shift workers
A 90-min nap before a night shift reduces fatigue-related errors significantly. Critical for safety-sensitive jobs.