Set the alarm clock for 10:39 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 10:37 am Alarm clock for 10:38 am Alarm clock for 10:40 am Alarm clock for 10:41 am

Going to bed for a 10:39 am alarm

Asleep by 1:24 am — 6 full sleep cycles, about 9 hours
Asleep by 2:54 am — 5 full sleep cycles, about 7 hours
Asleep by 4:24 am — 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.

10:39 am across the country

Sydney	10:39 am
Brisbane	10:39 am
Adelaide	10:09 am
Perth	8:39 am
Darwin	10:09 am

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

How to use the online alarm clock

If mornings mean footy training drop-offs, an early meeting, or getting the kids to school on time, 10:39 am is worth locking in properly. This rings straight from your browser at 10:39 am, and keeps ringing until you tell it to stop. No phone required nearby.

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 10:39 am is written 10:39, and spoken aloud it's twenty-one minutes to eleven in the morning. Written the Australian way that's 10.39 am, and typed in a hurry it's often 10:39am. Setting the alarm to 10:39 am tomorrow morning works the same way: if the time has gone for today, the count runs through to it.

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.