Set the alarm clock for 8:47 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 8:45 am Alarm clock for 8:46 am Alarm clock for 8:48 am Alarm clock for 8:49 am

Going to bed for a 8:47 am alarm

Asleep by 11:32 pm — 6 full sleep cycles, about 9 hours
Asleep by 1:02 am — 5 full sleep cycles, about 7 hours
Asleep by 2:32 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.

8:47 am across the country

London	8:47 am
Birmingham	8:47 am
Manchester	8:47 am
Glasgow	8:47 am
Belfast	8:47 am

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

How to use the online alarm clock

You have only just woken, so make 8:47 am the point when you get up and start preparing to warm the changing room before the school match. That leaves a clear marker before 9:00 am: enough time to dress, check what you need and avoid arriving at the sports hall still trying to organise the morning.

Because the warm-up may depend on a prompt while you are doing something else, set the alarm and keep this browser page running even if you move to another tab. Check that the volume is audible before putting the phone down. The alarm cannot safeguard the changing room schedule if the page is closed or the phone falls asleep, because 8:47 am may pass without a sound; use a separate phone alarm as a fallback if being late would leave pupils arriving to a cold space.

Once the changing room is warming, note the next commitment you have later that day and leave a small buffer before it. An early start can feel spacious, but kit checks, keys and the walk across the school grounds can quickly absorb spare minutes. Put the finish time for this task in your calendar now, allowing room to switch off equipment and leave the area ready before moving on.

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 8:47 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.