Set the alarm clock for 4:51 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 4:49 am Alarm clock for 4:50 am Alarm clock for 4:52 am Alarm clock for 4:53 am

Going to bed for a 4:51 am alarm

Asleep by 7:36 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:06 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:36 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.

4:51 am across the country

Sydney	4:51 am
Brisbane	4:51 am
Adelaide	4:21 am
Perth	2:51 am
Darwin	4:21 am

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

Online alarm clock for 4:51 am

Getting ready for the truck unload before the warehouse opens means checking the loading bay, paperwork and hi-vis gear before the alarm is needed. Set it for 4:51 am now, while everything is calm, so the nine minutes before 5:00 am can cover those final preparations without repeatedly checking the clock.

Because the alarm runs in the browser, closing the page or browser can prevent it sounding; if the phone or computer goes to sleep, the warehouse unload could begin without this reminder. Keep the alarm page open, leave the device awake and make sure its volume is audible over engines or dock noise. A quick sound check beforehand also confirms that silent mode or connected earbuds will not hide the alert.

Before an early warehouse shift, a small, familiar snack and some water are easier to manage than a full meal beside the loading area. Keep a bottle or thermos ready where it will not interfere with gloves, keys or paperwork. Rich food and another large drink can wait until the truck is settled and there is a proper break, reducing spills and last-minute rushing in the dark before dawn.

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.