Set the alarm clock for 4:05 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 4:03 am Alarm clock for 4:04 am Alarm clock for 4:06 am Alarm clock for 4:07 am

Going to bed for a 4:05 am alarm

Asleep by 6:50 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:20 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:50 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.

4:05 am across the country

London	4:05 am
Birmingham	4:05 am
Manchester	4:05 am
Glasgow	4:05 am
Belfast	4:05 am

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

Online alarm clock for 4:05 am

You are watching the last stretch of your supermarket shift, waiting for 4:05 am before you finish and hand over. Set the alarm for that exact time so you can keep an eye on the remaining jobs without checking the clock every few minutes. With 5:00 am still some way off, the alarm marks your actual finishing point rather than the next round hour.

During a quiet overnight shift, an alarm can appear to be ready while your phone is set to silent, so check the sound setting and choose an audible alert before relying on it. Raise the volume enough to hear it above refrigerators, cleaning equipment and staff-room noise. Because a browser alarm cannot sound after its page is closed or the phone goes to sleep, it should not be the only signal you rely on to finish your supermarket shift.

As the final jobs wind down at 4:05 am, a small drink of water and a light snack can be more practical than a heavy meal. Keep anything substantial for after you have clocked off, especially if you still need to travel home through the night. If you bring food from home, leave it ready in the staff fridge so your finish is not delayed by searching or preparation.

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 4:05 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.