Set the alarm clock for 4:20 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 4:18 am Alarm clock for 4:19 am Alarm clock for 4:21 am Alarm clock for 4:22 am

Going to bed for a 4:20 am alarm

Asleep by 7:05 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:35 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:05 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.

4:20 am across the country

Sydney	4:20 am
Brisbane	4:20 am
Adelaide	3:50 am
Perth	2:20 am
Darwin	3:50 am

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

Online alarm clock for 4:20 am

You’re waking at 4:20 am because the bakery dough has risen and the first bake still needs to begin. Settle your eyes, check that the alarm time reads 4:20 am, then get moving without losing the quiet preparation window before 5:00 am. Those 40 minutes can cover switching on the ovens, checking the dough and setting up the first trays.

Your bakery alarm needs to reach you clearly while the room is still quiet, so check where the sound will play before relying on it. Wireless headphones can remain connected unnoticed, sending the alert somewhere you will not hear it. Disconnect them or test the alarm at a low volume first. If the browser session ends or the computer falls asleep, the alarm will not sound, which could leave the dough waiting past its baking window; use a separate alarm as backup when timing matters.

Before leaving for an Australian bakery at this hour, allow for the actual trip rather than assuming every road will be empty. Traffic is usually light at 4:20 am, but overnight roadworks, freight vehicles and reduced-speed zones can add unexpected minutes. Check the route after waking, keep enough time for a safe drive, and plan to arrive before the ovens and trays need your attention.

Common questions

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.

Can I use this on my phone instead of a laptop?

Yes, it works in a mobile browser the same way, but phones are more likely to lock the screen or sleep, which can stop the alarm from ringing. A laptop or desktop tends to be more reliable for this.

Can I set more than one alarm at a time?

This page is built around a single alarm at a time. For multiple alarms, open a separate tab for each one and set a different time in each, keeping every tab open until it's rung.