Set the alarm clock for 11:23 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 11:21 am Alarm clock for 11:22 am Alarm clock for 11:24 am Alarm clock for 11:25 am

Going to bed for a 11:23 am alarm

Asleep by 2:08 am — 6 full sleep cycles, about 9 hours
Asleep by 3:38 am — 5 full sleep cycles, about 7 hours
Asleep by 5:08 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.

11:23 am across the country

London	11:23 am
Birmingham	11:23 am
Manchester	11:23 am
Glasgow	11:23 am
Belfast	11:23 am

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

How to use the online alarm clock

Finish what you are doing and head out for your circular walk on the public footpath, using the 11:23 am alarm as the signal to leave. That gives the outing a clear starting point while keeping 12:00 pm as an easy landmark for checking your progress along the route.

Your departure depends on the alarm sounding before you set off, so leave the browser visible and keep your phone or computer awake. If it goes to sleep first, the alarm may stay silent and delay the walk; it cannot alert you after the browser has been closed. Set the volume high enough to hear from where you are finishing up, then check that sound is permitted before relying on it.

A late-morning footpath can grow noticeably busier as midday approaches, particularly near a village, car park or popular access gate. At 11:23 am, listen for approaching cyclists, runners and dog walkers before stepping onto narrow sections, where conversation and traffic noise may hide them. Starting on the quieter side of the loop can make passing simpler, while saving the busier stretch until closer to 12:00 pm may mean meeting more people returning for lunch.

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.