Set the alarm clock for 6:40 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 6:38 am Alarm clock for 6:39 am Alarm clock for 6:41 am Alarm clock for 6:42 am

Going to bed for a 6:40 am alarm

Asleep by 9:25 pm — 6 full sleep cycles, about 9 hours
Asleep by 10:55 pm — 5 full sleep cycles, about 7 hours
Asleep by 12:25 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.

6:40 am across the country

Sydney	6:40 am
Brisbane	6:40 am
Adelaide	6:10 am
Perth	4:40 am
Darwin	6:10 am

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

How to use the online alarm clock

Uni lectures, gym sessions before work, or just a second alarm because the first one never works: 6:40 am is a popular time to want a backup. This rings from your browser at 6:40 am. No app store, no sign-up, just a tab that needs to stay open until it fires.

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 6:40 am is written 06:40, and spoken aloud it's twenty to seven in the morning. Written the Australian way that's 6.40 am, and typed in a hurry it's often 6:40am. Set an alarm for 6:40 am, set the alarm to 6:40 am, set my alarm for 6:40 am — all of it lands on this page and does the same thing.

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.