Set the alarm clock for 3:31 am

 

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::
 
 

Going to bed for a 3:31 am alarm

  • Asleep by 6:16 pm — 6 full sleep cycles, about 9 hours
  • Asleep by 7:46 pm — 5 full sleep cycles, about 7 hours
  • Asleep by 9:16 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.

3:31 am across the country

Sydney3:31 am
Brisbane3:31 am
Adelaide3:01 am
Perth1:31 am
Darwin3:01 am

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

Online alarm clock for 3:31 am

Finish the last checks and head out for the dawn tide when the 3:31 am alarm sounds. With the board already in the car from the evening before, there is no need to shift gear quietly through the house. The alarm leaves enough time to lock up, settle into the drive and be on the road before 4:00 am.

A surf departure can come unstuck when the alarm sounds through headphones that were left connected after listening to something earlier. Checking the selected audio output before settling down makes it clear whether the alert will come from the phone or disappear into the headphones. A second test at a low volume can confirm the speaker path without waking everyone. This browser alarm cannot wake you for the surf if its page is no longer running or the phone has gone into sleep mode, so a built-in backup alarm suits an essential departure.

Leaving home in the middle of the night means moving from a dark room into an equally dark driveway, then meeting dawn closer to the water. A small light placed beside the keys makes the final exit easier without flooding the house with brightness. The car’s cabin light can also be switched off beforehand, avoiding a sudden glare while loading the last item and letting your eyes stay adjusted for the early drive.

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.