Set the alarm clock for 3:19 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 3:17 am Alarm clock for 3:18 am Alarm clock for 3:20 am Alarm clock for 3:21 am

Going to bed for a 3:19 am alarm

Asleep by 6:04 pm — 6 full sleep cycles, about 9 hours
Asleep by 7:34 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:04 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.

3:19 am across the country

London	3:19 am
Birmingham	3:19 am
Manchester	3:19 am
Glasgow	3:19 am
Belfast	3:19 am

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

How to use the online alarm clock

Waking at 3:19 am gives you a quiet moment to get properly alert before releasing the relief crew onto the railway tracks. Set the alarm for this exact time, then use the space before 4:00 am to dress, check what you need and reach the handover without turning the start of the shift into a rush.

Because the alarm is running in your browser, switching to another tab may leave its page in the background, where the browser can reduce or pause activity. Return to the alarm page before settling down and keep the sound turned up. Your railway tracks handover could be missed if the browser is closed or the phone or computer goes to sleep, so use a separate alarm as a fallback when punctual release of the crew matters.

Once the relief crew is out and the immediate handover is finished, keep some of the early-morning margin for whatever follows later that day. Note the next fixed commitment before leaving, then allow enough time for travel, food and a short reset between duties. At this hour, a planned buffer makes it less likely that one delayed railway task will push every later job off schedule.

Common questions

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.

Will it still be right when the clocks change?

Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.

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.