Set the alarm clock for 4:23 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 4:21 am Alarm clock for 4:22 am Alarm clock for 4:24 am Alarm clock for 4:25 am

Going to bed for a 4:23 am alarm

Asleep by 7:08 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:38 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:08 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.

4:23 am across the country

London	4:23 am
Birmingham	4:23 am
Manchester	4:23 am
Glasgow	4:23 am
Belfast	4:23 am

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

How to use the online alarm clock

Break away from the job already under way at 4:23 am and set the alarm for the moment you need to start baking the morning buns for the tearoom. That leaves a clear marker before 5:00 am, so measuring, mixing or preparing trays does not quietly carry on past the planned start.

While the buns are being prepared, the alarm page can sit behind a recipe, message or music tab. A background tab may receive less attention from the browser, especially when battery-saving settings take over, so keep the alarm page open and the sound turned up. If the browser is shut down or the phone goes fully to sleep, no alarm will call you back to the buns.

Before leaving the current task, note what must follow the baking later that morning: cooling, glazing, packing or setting out the tearoom counter. Use the stretch between 4:23 am and the next commitment as a real buffer rather than filling every minute. Allowing room for a slow batch or an occupied oven makes the handover to the day’s next job less rushed.

Common questions

Can I use this on a phone?

It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.

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 4:23 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.