Set the alarm clock for 5:23 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 5:21 am Alarm clock for 5:22 am Alarm clock for 5:24 am Alarm clock for 5:25 am

Going to bed for a 5:23 am alarm

Asleep by 8:08 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:38 pm — 5 full sleep cycles, about 7 hours
Asleep by 11:08 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.

5:23 am across the country

Sydney	5:23 am
Brisbane	5:23 am
Adelaide	4:53 am
Perth	3:23 am
Darwin	4:53 am

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

Online alarm clock for 5:23 am

You’re waking at 5:23 am with the waterfront still quiet and your run not yet under way. Setting the alarm for this exact time gives you a moment to get out of bed, pull on your runners and gather what you need before heading outside. If you want to be moving by 6:00 am, keep that round hour as your departure deadline rather than letting the early start drift.

Your waterfront run can be delayed if the alarm is drowned out by a fan, traffic or audio already playing on your phone. Set the volume high enough to rise above the room’s background noise, then use the preview while you are still awake to check that the signal is distinct. This browser alarm will not sound once its page is closed or the phone has gone to sleep, so relying on it without keeping both active could leave the run starting later than planned.

Before settling back for the remaining sleep, decide what must happen after the run and work backwards from that commitment. Leave a practical buffer for getting home, cooling down, showering and preparing for work or study. At this early hour, a fixed turnaround point along the waterfront can protect that margin even if the outward leg feels unhurried, while water, keys and clothes set out beforehand reduce delays before 6:00 am.

Common questions

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.

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.