A 20 minute timer is considered the optimal power nap duration — long enough to provide deep rest but short enough to avoid sleep inertia. It's also widely used for HIIT workouts, cooking, and focused work intervals. Start your 20-minute countdown instantly.
Enable Repeat to automatically restart the countdown — perfect for interval training or back-to-back sessions. Enable End Time to see the exact clock time your timer will finish.
Click the Countdown tab, type 20 in the minutes field, then press play or Space. The alarm plays when 20 minutes are up.
Sleep researchers and NASA studies consistently identify 20 minutes as the sweet spot for napping. It allows light sleep stages (N1 and N2) for recovery without entering deep slow-wave sleep — meaning you wake refreshed with no grogginess.
Use Picture-in-Picture (PiP) mode. Click the PiP button to detach the timer into a floating window that stays on top of all other apps. Available on Chrome 116+ and Chromium-based browsers.