Set the alarm clock for 3:57 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 3:55 am Alarm clock for 3:56 am Alarm clock for 3:58 am Alarm clock for 3:59 am

Going to bed for a 3:57 am alarm

Asleep by 6:42 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:12 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:42 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.

3:57 am across the country

Sydney	3:57 am
Brisbane	3:57 am
Adelaide	3:27 am
Perth	1:57 am
Darwin	3:27 am

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

How to use the online alarm clock

Setting an alarm for 3:57 am while everyone else is asleep can feel like cheating the clock, but it's usually just planning ahead for an early departure or a shift that starts before sunrise. This will sound at 3:57 am through your speakers, whether it's the depths of winter or a short summer night.

Using it is simple: pick a ringtone from the list, press Start, and leave this tab open in your browser. The alarm runs entirely on this page, so closing the browser will stop it from going off. Come back a minute early if you're not sure you trust it yet.

It's free to use, doesn't need an account, and works the same in any modern browser, but it's honestly not meant to replace your phone for anything you can't afford to sleep through. Keep the tab open and the device awake, and it'll ring reliably at the time you set. On a 24-hour clock 3:57 am is written 03:57, and spoken aloud it's three minutes to four at night. You'll also see it written 3.57 am — a full stop instead of the colon means the same time. Whether you would say set alarm for 3:57 am or put an alarm on for 3:57 am, the steps are the same: pick a sound, press Start, leave the tab open.

Common questions

Do I need to create an account or download anything?

No, there's nothing to sign up for and nothing to install. Pick a time and a sound, press Start, and it runs entirely in this browser tab.

Can I change the alarm sound?

Yes, there's a short list of tones to choose from before you press Start. Pick whichever one you're most likely to actually hear — softer sounds are easier to sleep through than a firm chime or bell.

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.