Set the alarm clock for 4:25 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 4:23 am Alarm clock for 4:24 am Alarm clock for 4:26 am Alarm clock for 4:27 am

Going to bed for a 4:25 am alarm

Asleep by 7:10 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:40 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:10 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.

4:25 am across the country

Sydney	4:25 am
Brisbane	4:25 am
Adelaide	3:55 am
Perth	2:25 am
Darwin	3:55 am

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

How to use the online alarm clock

Nobody sets an alarm for 4:25 am for fun. Maybe it's an early shift at the depot, a long drive before the roads get busy, or you're still awake and don't trust yourself to notice the time. Pick a sound, set it for 4:25 am, and this page will handle the rest while the house stays quiet.

Choose a sound before you press Start — something like a chime or a classic bell tends to work better than anything too gentle. Once it's running, the countdown happens right here in the browser, which means the tab needs to stay open in the background rather than being closed.

The advantage of a browser alarm is volume and reliability at a desk: laptop speakers are often louder and easier to hear across a room than a phone left in a bag. The catch is that it depends entirely on the tab staying open; if the browser closes or the laptop sleeps, the alarm won't fire. On a 24-hour clock 4:25 am is written 04:25, and spoken aloud it's twenty-five past four at night. You'll also see it written 4.25 am — a full stop instead of the colon means the same time. Set an alarm for 4:25 am, set the alarm to 4:25 am, set my alarm for 4:25 am — all of it lands on this page and does the same thing.

Common questions

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.

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.