Set the alarm clock for 3:45 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 3:43 am Alarm clock for 3:44 am Alarm clock for 3:46 am Alarm clock for 3:47 am

Going to bed for a 3:45 am alarm

Asleep by 6:30 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:00 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:30 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.

3:45 am across the country

Sydney	3:45 am
Brisbane	3:45 am
Adelaide	3:15 am
Perth	1:45 am
Darwin	3:15 am

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

How to use the online alarm clock

Three in the morning has its own kind of silence, and an alarm for 3:45 am breaks it on purpose. Whether you're catching a pre-dawn flight or grabbing a short nap before a long haul, this tool rings at 3:45 am through your browser so you're not relying on a phone across the room.

Start by selecting a tone from the dropdown, then hit Start to lock it in. From that point the page does the counting, and it'll ring once the time is reached, but only if the tab is still open somewhere on your device. Closing it, or the browser entirely, cancels the alarm.

Unlike a phone alarm, this one won't ring if you close the tab, put the computer to sleep, or shut the lid, so it suits a desk, a kitchen bench, or anywhere the device stays powered on and awake. It's free to use and doesn't need an account, but it's not built for unattended overnight use. On a 24-hour clock 3:45 am is written 03:45, and spoken aloud it's quarter to four at night. Written the Australian way that's 3.45 am, and typed in a hurry it's often 3:45am. If you need it loud, turn the system volume up before you start: the alarm plays at whatever the device is set to.

Common questions

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.

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.