Set the alarm clock for 6:39 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 6:37 am Alarm clock for 6:38 am Alarm clock for 6:40 am Alarm clock for 6:41 am

Going to bed for a 6:39 am alarm

Asleep by 9:24 pm — 6 full sleep cycles, about 9 hours
Asleep by 10:54 pm — 5 full sleep cycles, about 7 hours
Asleep by 12:24 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.

6:39 am across the country

Sydney	6:39 am
Brisbane	6:39 am
Adelaide	6:09 am
Perth	4:39 am
Darwin	6:09 am

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

Online alarm clock for 6:39 am

As you finish securing the trailer and head out the door, a 6:39 am alarm can mark the moment to leave before the day heats up. That gives you 21 minutes before 7:00 am to check the coupling, lights and safety chains, then get the ute moving while the road and bitumen are still relatively cool.

Because you are leaving as soon as it sounds, keep this browser open after setting the alarm and make sure the sound is audible. Closing the page or browser prevents the alarm from sounding, so your trailer departure would receive no warning at 6:39 am. If the screen may lock while you finish outside, adjust the relevant power settings beforehand and leave the volume high enough to hear from the driveway.

With the trailer ready the night before, the early start does not have to take more sleep than the departure itself requires. Set out keys, water and any paperwork before bed, and avoid leaving small packing decisions for 6:39 am. A second alarm on a separate clock can protect the remaining sleep from being cut short by repeated checks, while still providing a backup for this pre-heat departure.

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.