Set the alarm clock for 5:13 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 5:11 am Alarm clock for 5:12 am Alarm clock for 5:14 am Alarm clock for 5:15 am

Going to bed for a 5:13 am alarm

Asleep by 7:58 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:28 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:58 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.

5:13 am across the country

Sydney	5:13 am
Brisbane	5:13 am
Adelaide	4:43 am
Perth	3:13 am
Darwin	4:43 am

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

Online alarm clock for 5:13 am

While you are preparing early for a ferry across the bay, set the alarm for 5:13 am before the departure rush begins. That gives you a clear cue to finish packing, check the sailing timetable and gather anything needed at the terminal. With 6:00 am approaching, you can keep the remaining preparation tied to the ferry’s fixed schedule rather than repeatedly checking the clock.

A ferry departure is easy to miss if the alarm sound has quietly been routed to headphones left in a pocket or another room. Before relying on this browser alarm, play some audio and confirm that it comes from the speaker you will actually hear. Set a sensible volume, then leave the headphones disconnected unless you plan to wear them. Do not make this alarm your only safeguard for the ferry: it may remain silent if you leave the page or your phone goes to sleep.

Before leaving for the waterfront at this early hour, check how long the drive, walk or public transport connection usually takes and add a buffer for parking or reaching the boarding point. Roads may be quieter around 5:13 am, but reduced overnight services and terminal access arrangements can still add time. Work backwards from the timetable so the alarm marks a useful departure cue, not merely the moment you should start getting ready.

Common questions

Will the alarm still ring if I close the browser tab?

No. The alarm only runs while this tab stays open — closing it, or closing the browser entirely, stops the countdown before it can ring. Keep the tab open in the background if you need it to go off later.

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.