Set the alarm clock for 11:24 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 11:22 am Alarm clock for 11:23 am Alarm clock for 11:25 am Alarm clock for 11:26 am

Going to bed for a 11:24 am alarm

Asleep by 2:09 am — 6 full sleep cycles, about 9 hours
Asleep by 3:39 am — 5 full sleep cycles, about 7 hours
Asleep by 5:09 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.

11:24 am across the country

London	11:24 am
Birmingham	11:24 am
Manchester	11:24 am
Glasgow	11:24 am
Belfast	11:24 am

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

How to use the online alarm clock

While you get the lead, waste bags and a light layer ready for your dog’s walk on Hampstead Heath, set the alarm for 11:24 am. Preparing now leaves time to check the weather and choose a route before heading out. You will still have a comfortable margin before 12:00 pm if a water bottle or keys need finding.

As those walking things are gathered, the alarm page can remain behind another page while you check a map or forecast; it should continue counting down and sound at 11:24 am. Keep the browser running and avoid silencing it accidentally. If the browser is closed or the computer goes to sleep, the dog-walk reminder will not sound, so use a separate alarm when missing the departure time would disrupt your plans.

Before a late-morning outing across the Heath, a small drink is easier to manage than carrying an unnecessary bottle from the first path. Have some water before leaving, and pack enough for the dog if the weather is warm or the route is long. A full lunch can wait until after the walk; at 11:24 am, a modest snack is less awkward than setting off immediately after a heavy meal.

Common questions

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 11:24 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.

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.