Set the alarm clock for 7:59 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 7:57 am Alarm clock for 7:58 am

Going to bed for a 7:59 am alarm

Asleep by 10:44 pm — 6 full sleep cycles, about 9 hours
Asleep by 12:14 am — 5 full sleep cycles, about 7 hours
Asleep by 1:44 am — 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.

7:59 am across the country

London	7:59 am
Birmingham	7:59 am
Manchester	7:59 am
Glasgow	7:59 am
Belfast	7:59 am

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

How to use the online alarm clock

You’re taking in the last of dawn from Snowdon’s summit and getting ready to head down. A 7:59 am alarm gives you a clear cue to finish the moment, check that nothing has been left behind and begin your descent as 8:00 am arrives, rather than lingering without noticing the time.

With gloves, pockets and changing weather competing for your attention, the alarm needs to be audible before you rely on it. Check the selected tone and your volume setting, as silent mode may prevent the signal from reaching you. If the browser page is closed or your phone or laptop falls asleep, no alarm will sound, which could delay your departure from Snowdon’s summit. Keeping the page active and the screen awake gives the browser the chance to play the alert at 7:59 am.

As walkers begin moving around the summit near 8:00 am, conversation, footsteps and rustling kit can make a quiet tone easy to miss. A distinctive signal set above the surrounding noise is more useful than one resembling a message notification. Once you start descending, keep the device somewhere its sound is not muffled by spare layers or buried deep inside your rucksack.

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.