Set the alarm clock for 5:31 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 5:29 am Alarm clock for 5:30 am Alarm clock for 5:32 am Alarm clock for 5:33 am

Going to bed for a 5:31 am alarm

Asleep by 8:16 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:46 pm — 5 full sleep cycles, about 7 hours
Asleep by 11:16 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.

5:31 am across the country

Sydney	5:31 am
Brisbane	5:31 am
Adelaide	5:01 am
Perth	3:31 am
Darwin	5:01 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 5:31 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 5:31 am sharp through your speakers, so you can finally close the laptop and get some sleep.

There's a short list of sounds to choose from before you press Start — pick one that suits how deep a sleeper you are. Once it's set, the page keeps time in the background of your browser, and it'll sound at the moment you selected, provided the tab hasn't been 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 5:31 am is written 05:31, and spoken aloud it's twenty-nine minutes to six in the morning. Timetables and rosters may show it as 05:31, and handwritten notes as 5.31 am. Setting the alarm to 5:31 am tomorrow morning works the same way: if the time has gone for today, the count runs through to it.

Common questions

Will the alarm still ring if I close the browser tab?

No. The alarm only runs while this tab stays open — closing it, or closing the browser entirely, stops the countdown before it can ring. Keep the tab open in the background if you need it to go off later.

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.