Set the alarm clock for 4:09 am

 

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

The alarm goes off in: ::
 
 

Going to bed for a 4:09 am alarm

  • Asleep by 6:54 pm — 6 full sleep cycles, about 9 hours
  • Asleep by 8:24 pm — 5 full sleep cycles, about 7 hours
  • Asleep by 9:54 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.

4:09 am across the country

Sydney4:09 am
Brisbane4:09 am
Adelaide3:39 am
Perth2:09 am
Darwin3:39 am

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

Online alarm clock for 4:09 am

While pulling on your wetsuit and checking the dawn tide, a 4:09 am alarm gives you a clear cue to stop preparing and head for the car. Your board is already inside from the night before, so there is no need to reshuffle gear in the dark. The alert also leaves enough time before 5:00 am to reach the beach and assess the surf from shore.

Because swell and weather checks can send the alarm page into the background, keep its audio permission active and return to it once before putting the phone down. A background page may remain ready, but some browser or battery settings can restrict what it does. If the browser is closed or the phone falls asleep, the surf alarm may not sound, leaving you preparing longer than planned and potentially missing the tide window.

Among the dim dashboard lights and early beach darkness, a bright screen can feel harsh on the eyes. Lower the display brightness before 4:09 am, use a warmer colour setting if available, and place the phone face down after confirming the alarm. Keep a small torch near the wetsuit or keys so finding the last items does not require repeatedly lighting the whole screen.

Common questions

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.

Is there a cost to use this?

No, it's free, with no sign-up and no limit on how many times you set it. It just needs the tab left open until the time you've chosen arrives.