Set the alarm clock for 4:57 am

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::

You can also try the other alarm clocks

Alarm clock for 4:55 am Alarm clock for 4:56 am Alarm clock for 4:58 am Alarm clock for 4:59 am

Going to bed for a 4:57 am alarm

Asleep by 7:42 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:12 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:42 pm — 4 full sleep cycles, about 6 hours

A sleep cycle runs about 90 minutes, and most people take around 15 minutes to drop off. Waking at the end of a cycle feels easier than waking in the middle of one.

4:57 am across the country

Sydney	4:57 am
Brisbane	4:57 am
Adelaide	4:27 am
Perth	2:57 am
Darwin	4:27 am

Times are worked out live in your browser, so daylight saving is already accounted for.

Online alarm clock for 4:57 am

While you watch the clock for a remote outback astronomy shoot, set the alarm for 4:57 am so the planned exposure or equipment check does not drift past its mark. With only a short interval before 5:00 am, this is the moment to keep your hands free for the camera, tripod and notes while the alarm tracks the appointed time.

For astronomy photography far inland, confirm the sound well before darkness and distance make a missed cue difficult to fix. Set a brief test alarm, raise the volume to a level you can hear near the gear, and check that the signal plays through the speaker you intend to use. The alarm cannot protect the photography schedule if the browser has been closed or the phone has fallen asleep, so use a separate clock or phone alarm as backup for a critical exposure.

Anyone asleep in the house may hear a 4:57 am signal long before their own morning begins. Before heading inland, choose a restrained tone and keep the phone close enough that a lower volume will still reach you. If you are preparing at home, silence the alarm promptly and pack camera cases away from bedrooms; small choices matter at this hour, when ordinary household sounds carry through quiet rooms.

Common questions

What happens once the alarm goes off?

It rings through your device's speakers on a loop until you stop it from this page. There's no separate app notification, so make sure your volume is turned up before you rely on it.

Is this alarm accurate across daylight saving time?

It uses your device's local clock, so as long as your computer's time and date settings are correct, it'll adjust automatically when daylight saving time starts or ends.

Can I use this on my phone instead of a laptop?

Yes, it works in a mobile browser the same way, but phones are more likely to lock the screen or sleep, which can stop the alarm from ringing. A laptop or desktop tends to be more reliable for this.

Can I set more than one alarm at a time?

This page is built around a single alarm at a time. For multiple alarms, open a separate tab for each one and set a different time in each, keeping every tab open until it's rung.