Set the alarm clock for 9:41 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 9:39 am Alarm clock for 9:40 am Alarm clock for 9:42 am Alarm clock for 9:43 am

Going to bed for a 9:41 am alarm

Asleep by 12:26 am — 6 full sleep cycles, about 9 hours
Asleep by 1:56 am — 5 full sleep cycles, about 7 hours
Asleep by 3:26 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.

9:41 am across the country

London	9:41 am
Birmingham	9:41 am
Manchester	9:41 am
Glasgow	9:41 am
Belfast	9:41 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 finish what you are doing and get ready to leave, set the alarm for 9:41 am so the dog’s walk across Hampstead Heath does not slip into the rest of the morning. That leaves a useful 19-minute stretch before 10:00 am: enough time to gather the lead, waste bags and a light layer without turning the departure into a rush.

Before heading towards the Heath, check where your phone is sending its audio. Wireless headphones may still be connected inside a coat pocket or another room, making the alarm difficult to hear even though it appears to run normally. Play a brief test sound, then choose the phone speaker or keep the headphones with you. Keep the alarm page open and the phone awake, because otherwise the alert may not sound and the dog walk could begin later than planned.

With the walk falling in the later part of the morning, a small drink before leaving is practical, particularly if the route will cover the open paths around the Heath. A light snack can fit into the final preparations, but a larger breakfast is easier to leave until afterwards rather than carrying it or setting off immediately after eating. Pack water for the dog as well if the morning is warm or the outing will be long.

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.