Set the alarm clock for 4:00 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 4:01 am Alarm clock for 4:02 am

Going to bed for a 4:00 am alarm

Asleep by 6:45 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:15 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:45 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.

4:00 am across the country

Sydney	4:00 am
Brisbane	4:00 am
Adelaide	3:30 am
Perth	2:00 am
Darwin	3:30 am

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

How to use the online alarm clock

If you're still up rather than getting up, setting this for 4:00 am gives you a hard stop. Daylight saving time or not, the sun won't be up yet. It works the same regardless of the season, ringing at 4:00 am sharp through your speakers, so you can finally close the laptop and get some sleep.

Pick whichever sound you're most likely to actually notice, then press Start. The alarm is tied to this browser tab, so it needs to stay open. Minimising the window is fine, but closing the tab or the browser will stop the countdown before it ever rings.

Because this runs in the browser rather than on the phone's operating system, it sidesteps silent mode and do-not-disturb entirely, useful if your phone alarm has ever failed to go off for exactly that reason. Just be aware it needs the tab open and the screen or laptop lid to stay on to actually ring. On a 24-hour clock 4:00 am is written 04:00, and spoken aloud it's four o'clock at night. Written the Australian way that's 4.00 am, and typed in a hurry it's often 4:00am. Whether you would say set alarm for 4:00 am or put an alarm on for 4:00 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.