Set the alarm clock for 4:24 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 4:22 am Alarm clock for 4:23 am Alarm clock for 4:25 am Alarm clock for 4:26 am

Going to bed for a 4:24 am alarm

Asleep by 7:09 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:39 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:09 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.

4:24 am across the country

London	4:24 am
Birmingham	4:24 am
Manchester	4:24 am
Glasgow	4:24 am
Belfast	4:24 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 what you are doing when the 4:24 am alarm sounds, leaving enough time to reach the station and meet the last train. At this hour, a coat, keys and ticket are easily forgotten in the rush, so keep them together before returning to your current task. The alarm creates a clear stopping point, while 5:00 am remains a useful marker for judging how late the journey may run.

Meeting the train depends on noticing the alert, so check the phone’s silent settings and set an audible volume before relying on it. A brief test can confirm that the sound carries from wherever the phone will be left. Because this browser alarm cannot sound after its page is closed or the phone falls asleep, the train may arrive while you are still occupied; keep the page open, the phone awake and a separate alarm available.

Once the station trip is planned, leave some breathing room before the next commitment later that day. Overnight transport can involve a dark walk, a quiet platform or a wait for a taxi, and each may take longer than expected. Note the earliest realistic return time, then allow a buffer before work, childcare or another fixed responsibility rather than treating the journey as finished when the train arrives.

Common questions

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.

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 4:24 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.