Set the alarm clock for 4:38 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 4:36 am Alarm clock for 4:37 am Alarm clock for 4:39 am Alarm clock for 4:40 am

Going to bed for a 4:38 am alarm

Asleep by 7:23 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:53 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:23 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.

4:38 am across the country

Sydney	4:38 am
Brisbane	4:38 am
Adelaide	4:08 am
Perth	2:38 am
Darwin	4:08 am

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

How to use the online alarm clock

Tradies, nurses on night shift, and anyone driving to the airport before the birds wake up all end up here around 4:38 am. This alarm rings straight from your browser tab at 4:38 am, loud enough to cut through a quiet house, without needing an app or an account first.

Start by selecting a tone from the dropdown, then hit Start to lock it in. From that point the page does the counting, and it'll ring once the time is reached, but only if the tab is still open somewhere on your device. Closing it, or the browser entirely, cancels the alarm.

A browser alarm like this one is handy when your phone's on silent, charging in another room, or you just don't want to unlock it and get pulled into notifications. The trade-off is honesty: it only rings while this tab stays open, so it's not a replacement for your phone alarm on a trip where the laptop lid might close. On a 24-hour clock 4:38 am is written 04:38, and spoken aloud it's twenty-two minutes to five in the morning. Timetables and rosters may show it as 04:38, and handwritten notes as 4.38 am. Setting the alarm to 4:38 am tomorrow morning works the same way: if the time has gone for today, the count runs through to it.

Common questions

Does the alarm work if my laptop goes to sleep?

Not reliably. If the device sleeps or the screen locks, the browser tab pauses along with it, so the alarm may not fire on time or at all. Adjust your power settings if you're relying on this over a longer stretch.

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.