Set the alarm clock for 3:51 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 3:49 am Alarm clock for 3:50 am Alarm clock for 3:52 am Alarm clock for 3:53 am

Going to bed for a 3:51 am alarm

Asleep by 6:36 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:06 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:36 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.

3:51 am across the country

Sydney	3:51 am
Brisbane	3:51 am
Adelaide	3:21 am
Perth	1:51 am
Darwin	3:21 am

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

Online alarm clock for 3:51 am

You’re watching the risen dough and waiting for the precise moment to move it into the oven. Set the alarm for 3:51 am so you can keep preparing trays without repeatedly checking the clock. With 4:00 am approaching, there is still time to finish shaping a final batch or clear the bench before baking begins.

While the dough waits, keep this alarm visible and make sure the sound is turned up enough to hear from the bakery workspace. A browser alarm may not sound if the computer or phone falls asleep, so the dough could remain out longer than planned; keep the machine awake and the browser running until 3:51 am. If the timing matters for several trays, use a separate kitchen timer as a backup.

Before the household is awake, a sudden alarm can carry through quiet rooms. At this hour of the night, lower the volume if you are working nearby, choose a brief tone, and close doors between the kitchen and sleeping areas. Place trays, oven mitts and a tea towel within reach beforehand, so you can silence the alarm promptly and handle the risen dough without waking anyone else.

Common questions

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.

Why use a browser alarm instead of my phone's built-in one?

Mainly for reliability against silent mode, do-not-disturb, or a phone left charging out of earshot. It's a useful backup or a desk-based alternative, though it depends on this tab staying open rather than running in the background of your phone.