How to use your phone as a sunrise alarm
Key takeaways
- A phone or tablet can act as a gentle wake-up light if it stays open, on and unlocked all night, plugged in.
- Place it near your face, screen towards you, for example on the bedside table or a stand.
- Set your phone's own alarm as a backup: browsers can release the screen lock or pause sound.
- A screen is dimmer than a sunrise lamp. It is a cue, not light therapy.
Can a phone really work as a sunrise alarm?
Yes, as a soft light cue, within limits. A web page or app can turn the screen from dark to warm light before your alarm and then play a sound. Sunrise Alarm Clock does this in the browser, with no app to install. The catch is that the phone has to stay awake and unlocked with the page open, and a screen gives off far less light than a lamp made for the job.
How do I set it up for the night?
- Plug in the charger. The screen stays on all night, which uses battery, and power-saving modes can stop the page.
- Open Sunrise Alarm Clock, choose your wake-up time, a sunrise length (30 minutes is a common choice), the light level and a sound.
- Run the 30-second demo while you are awake, at the volume you will use.
- Leave "Keep screen awake" on. It asks the browser to stop the screen from dimming and locking. Some browsers do not support it, and the device can release it, so also check your auto-lock setting.
- Place the screen where you will see it: on the bedside table, tilted towards your pillow, not face down or behind a lamp.
- Set a backup alarm in your phone's clock app a few minutes after the sunrise ends.
- Leave the page open. Switching apps, locking the screen or closing the tab ends the session.
Should I use a phone or a tablet?
A tablet is usually better: the larger screen gives off more light, it is easier to stand up, and you keep your phone free. Any device with a modern browser works. A laptop on a desk across the room will hardly light your face.
How does a screen sunrise compare with a sunrise lamp?
| Screen sunrise | Sunrise lamp | |
|---|---|---|
| Light | Dim; depends on screen size and placement | Brighter; studies used about 50–300 lux |
| Needs the device on all night | Yes, open and unlocked | No |
| Sound | Built-in sounds or your own file | Depends on the model |
| Works if the page closes | No | Yes |
| Install | Nothing; open the page | A separate device |
What can stop a screen sunrise?
A locked screen, a closed or reloaded tab, a low battery, power saving, an incoming call that takes over the screen, or a browser update in the night. Sound also needs one tap on the page before it may play, which is why you start the sunrise with a button. If the page was hidden, Sunrise Alarm Clock ends the session and asks you to start again. That is why the backup alarm matters.
Frequently asked questions
Is there a free sunrise alarm app for iPhone? Sunrise Alarm Clock runs in Safari on iPhone and iPad, with no app to install. Vibration and background running are not available in the browser; keep the Clock app's alarm as a backup.
Does it work on Android? Yes, in Chrome and other modern browsers. Check that battery optimisation does not close the browser at night.
Will the screen damage my eyes or sleep? The page stays dark until the sunrise starts. If light at night bothers you, lower the light level or use the "light only" choice later in the morning.
Sources
- MDN Web Docs. Screen Wake Lock API.
- MDN Web Docs. Autoplay guide for media and Web Audio APIs.
- Apple Support. How to set and change alarms on your iPhone.
- Google Clock Help. Set, cancel, or snooze alarms.
Last reviewed 12 November 2026.