Set the alarm clock for 5:59 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 5:57 am Alarm clock for 5:58 am

Going to bed for a 5:59 am alarm

Asleep by 8:44 pm — 6 full sleep cycles, about 9 hours
Asleep by 10:14 pm — 5 full sleep cycles, about 7 hours
Asleep by 11:44 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.

5:59 am across the country

London	5:59 am
Birmingham	5:59 am
Manchester	5:59 am
Glasgow	5:59 am
Belfast	5:59 am

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

How to use the online alarm clock

As you hand the early shift to a colleague, a 5:59 am alarm can mark the moment to leave for the first train to London. The handover needs to be genuinely finished: notes passed across, keys returned and any last question answered. With 6:00 am arriving just after the alert, there is no spare stretch for another task before heading towards the station.

During that final handover, the alarm page may sit behind a rota, message or travel screen. It can remain running in the background, so the visible page does not need to stay in front throughout the minute. However, the first-train plan cannot rely on this alarm if the browser has been fully shut or the phone has settled into sleep, because the sound may never happen. Keeping the browser active and the volume audible makes the signal more dependable while attention is elsewhere.

Leaving at 5:59 am can make the remaining sleep feel especially relevant, particularly after a night shift. Rather than treating the journey as extra rest, allow for staying awake until safely seated on the train, then use a separate alarm for the correct stop if a short nap is realistic. A coat folded behind the neck and belongings kept secured can make that brief rest simpler without losing track of the journey.

Common questions

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.

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.