Free Online Nap Timer
A free online nap timer with power-nap presets, a fall-asleep buffer, and a gentle gradual wake-up — all in a calm, full-screen interface.
Free · No sign-up · Runs in your browser · Nothing to install · Settings saved on your device
This is a free online nap timer — no sign-up, nothing to install, all of it running in your browser — where you pick 10, 20, 26 or 90 minutes or any length up to 120, add a fall-asleep buffer of five or ten minutes, choose a chime, bell or singing bowl, and wake to a bell that rises over thirty seconds instead of jolting you awake, with your settings kept in that browser and nothing sent to a server. The presets are there because nap length matters: ten minutes for a quick refresh, twenty for a power nap, twenty-six for the NASA nap, ninety for a full sleep cycle. The buffer puts its silence before the real countdown, so the timer is not already ticking while you are still settling in.
How to use
- 1
Choose a nap length. Pick 10, 20, 26 or 90 minutes, or type a custom length up to 120 minutes.
- 2
Set the fall-asleep buffer. Add 5 or 10 minutes of silence before the countdown starts, or leave it off.
- 3
Pick a wake-up bell. Choose Chime, Bell or Singing bowl. Toggle gradual wake-up for a 30-second crescendo.
- 4
Press Begin. The screen goes quiet. If you set a buffer, the nap countdown starts after that time passes.
- 5
Rest until the bell. Close your eyes. The wake-up bell rings — gently or all at once — when the nap is over.
Why nap length matters
A nap can leave you sharper or groggier, and the difference is almost entirely about when you wake up relative to your sleep cycle. A cycle runs roughly ninety minutes from light sleep through deep slow-wave sleep and back through lighter REM. Waking during deep sleep — typically between twenty and sixty minutes in — is what causes sleep inertia, that heavy, confused feeling that makes a long nap feel worse than no nap at all.
The research behind the common presets is straightforward. A ten-minute nap stays in light sleep and produces a quick, clean boost with almost no inertia. Twenty minutes does the same with a slightly larger benefit. The twenty-six-minute figure comes from a NASA study on pilots: a planned nap of that length improved alertness by 54% and performance by 34%, with wake-up before the onset of slow-wave sleep. Ninety minutes completes a full cycle, so you surface during lighter sleep and wake up with better mood and creativity but at the cost of a longer break. Anything in between risks the deep-sleep window.
The fall-asleep buffer
Most people do not fall asleep the instant they close their eyes. Sleep latency — the time it takes to actually fall asleep — varies by person and day, but five to fifteen minutes is typical for someone who is moderately tired. A nap timer that starts counting the moment you press Begin is counting your wakefulness against your nap. Twenty minutes becomes fifteen of sleep and five of lying there.
The fall-asleep buffer adds a period of silence before the nap countdown begins. Set it to five or ten minutes, and the real timer starts only after that window has passed. The screen stays dark and quiet, no sound, no countdown visible. It is the same principle behind the sleep-onset timers in dedicated devices, without the device.
Gradual wake-up
A sudden alarm is the worst way to end a nap. It triggers a stress response — a spike in cortisol and heart rate — that compounds whatever sleep inertia you already have. A gradual wake-up does the opposite. This timer rings five bells over thirty seconds, each one a little louder than the last. The first is barely there; the last is unmistakable. Most people begin to surface around the second or third bell, which puts them in a lighter, calmer state by the time the full-volume bell arrives.
You can switch to a single bell in the settings if you prefer a clean endpoint. Choose from three sounds: a chime with a quick two-note strike, a clear bell, or a Tibetan singing bowl with slow overtones. Each one previews when you select it.
When and where to nap
The best time for a nap is early to mid-afternoon, roughly between one and three p.m., when the post-lunch dip in alertness arrives. A nap later than four risks pushing back your nighttime sleep onset, and a nap in the morning is rarely needed unless you are severely sleep-deprived. Pick a place where you can recline or at least lean back. Light and noise both slow sleep onset, so a dark room or an eye mask helps, and the ambient sound option on this timer — rain, ocean, or white noise — can mask a noisy office or shared space.
Press F for full screen so the display is the only thing on the monitor. Add white noise or rain if the room is not quiet. Then press Begin, close your eyes, and let the buffer handle the transition. The bell will find you.
Link parameters
Every setting travels in the address bar, so a link can open the timer already set up.
| Parameter | Values | Example |
|---|---|---|
| d | nap length, 1 to 120 minutes (default 20) | /nap-timer/?d=26 |
| buf | fall-asleep buffer, 0 to 10 minutes (0 is off, default 5) | /nap-timer/?buf=10 |
| bell | chime, bell or bowl (default chime) | /nap-timer/?bell=bowl |
| grad | 1 or 0 — the gradual 30-second wake-up (default 1) | /nap-timer/?grad=0 |
| sound | rain, ocean or white | /nap-timer/?sound=rain |
| theme | sea, night, dawn or forest (default night) | /nap-timer/?theme=dawn |
/nap-timer/?d=26&buf=5 opens the NASA nap with five minutes of silence to fall asleep in first.
/nap-timer/?d=90&bell=bowl&sound=rain opens a full-cycle nap that ends on a singing bowl, with rain underneath.
/nap-timer/?d=20&grad=0&theme=dawn opens a twenty-minute nap on the dawn background that ends on one bell rather than five.
Frequently Asked Questions
Is there a free online nap timer with no sign-up? +
Completely free, with no account, no ads, and nothing to install. It runs in any modern browser: pick a length, set the fall-asleep buffer if you want one, and press Begin. Your settings are saved in that browser and never sent to a server.
How long should a power nap be? +
Ten to twenty minutes is the standard recommendation. A ten-minute nap produces a quick alertness boost with almost no sleep inertia. Twenty minutes adds a slightly larger benefit while still waking you before deep sleep begins. The twenty-six-minute NASA preset pushes the boundary: pilots in the study napped for that long and saw a 54% jump in alertness, with wake-up just before the slow-wave window.
What is the 26-minute NASA nap? +
A 1995 NASA study on long-haul pilots found that a planned 26-minute in-flight nap improved alertness by 54% and task performance by 34% compared to a no-nap control group. The length was chosen to keep pilots in lighter sleep stages and avoid slow-wave inertia. It has since become a popular preset in nap timers.
Why is there a fall-asleep buffer? +
Because you do not fall asleep the instant you close your eyes. Most people take five to fifteen minutes to drift off. The buffer adds that time before the nap countdown starts, so a twenty-minute nap is twenty minutes of actual sleep, not twenty minutes minus however long you spent settling in.
What does gradual wake-up do? +
Instead of one bell at full volume, the timer rings five bells over thirty seconds, each louder than the last. The first is barely audible; the last is unmistakable. The rising volume lets you surface gently rather than being startled awake, which reduces the cortisol spike of a sudden alarm.
Will the timer still wake me if I switch tabs? +
Yes. The wake-up bells are scheduled on the browser audio clock, so they fire on time even if the tab is throttled. A locked phone screen is different — the page stops running. The timer holds the screen awake during a session on browsers that support the Wake Lock API.
Can I share the timer with someone? +
Yes. Your settings — nap length, buffer, bell, sound and theme — are encoded in the link. Copy it and send it; the other person opens the same configuration. No account needed.
Related tools
More quiet tools
Box Breathing Timer
The 4-4-4-4 technique used by Navy SEALs for calm and focus.
Focus Timer
A full-screen study timer with Pomodoro presets, ambient sound, and calm backgrounds.
Meditation Timer
A minimal timer with singing bowls, interval bells, and a mindfulness bell that rings at your chosen pace.
Stillsea is for general wellbeing and is not medical advice. Consult a healthcare professional for any health concerns.