Set the alarm clock for 3:12 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 3:10 am Alarm clock for 3:11 am Alarm clock for 3:13 am Alarm clock for 3:14 am

Going to bed for a 3:12 am alarm

Asleep by 5:57 pm — 6 full sleep cycles, about 9 hours
Asleep by 7:27 pm — 5 full sleep cycles, about 7 hours
Asleep by 8:57 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.

3:12 am across the country

London	3:12 am
Birmingham	3:12 am
Manchester	3:12 am
Glasgow	3:12 am
Belfast	3:12 am

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

How to use the online alarm clock

Waiting for a night delivery at the pub, you are watching the clock rather than settling into another job. An alarm for 3:12 am marks the agreed moment without making you check the time every few minutes. If the driver is delayed, there is still a clear point from which to judge the wait before 4:00 am arrives.

The pub delivery is a useful reason to test the alarm sound while the building is still quiet enough to hear it clearly. Set a temporary alarm first, check that its tone is audible above any cellar fans or glass washers, then return to 3:12 am. If you close the alarm page, or the phone or laptop falls asleep, no sound will play and the delivery may be left waiting outside. A separate phone alarm provides sensible cover when opening the door on time matters.

While you watch for the delivery, a small snack such as toast or a banana is easier to fit around an uncertain arrival than a full meal. Tea or water can help pass the wait, but several strong coffees may feel excessive when the night shift is nearly over. Leave anything that needs cooking until the goods are inside, so an unattended pan or grill does not compete with listening for the driver at 3:12 am.

Common questions

Does the alarm still work if I close the tab?

No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.

What happens if my laptop goes to sleep before 3:12 am?

The tab sleeps along with it and the alarm will not sound on time, if at all. If you are relying on it, change the power settings so the machine stays awake, or keep a phone alarm running as well.

Do I need an account or an app?

Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.

Can I change the sound?

Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.