Set the alarm clock for 8:51 am

 

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::
 
 

Going to bed for a 8:51 am alarm

  • Asleep by 11:36 pm — 6 full sleep cycles, about 9 hours
  • Asleep by 1:06 am — 5 full sleep cycles, about 7 hours
  • Asleep by 2:36 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.

8:51 am across the country

London8:51 am
Birmingham8:51 am
Manchester8:51 am
Glasgow8:51 am
Belfast8:51 am

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

How to use the online alarm clock

Waking at 8:51 am leaves a short, useful window before you need to open the canal lock for the first boat. Rather than starting the morning in a rush, you have nine minutes to get dressed, collect the key and reach the gate by 9:00 am. Keeping those few tasks simple makes the alarm a clear signal to get moving.

For this particular start, the alert needs to be audible enough to pull you fully awake. Check the phone’s sound level before settling down, as silent mode may prevent the tone you expect even though the alarm appears correctly set. If the page is dismissed or the phone falls asleep, the browser alarm cannot sound, which could leave the canal lock closed when the boat arrives. A separate clock provides a sensible fallback for this responsibility.

Canals can be very quiet before activity begins, but the soundscape often changes as 9:00 am approaches: engines start, walkers pass and voices carry across the water. Set the alarm slightly louder than the noise likely to reach the room, then leave the phone near enough to hear without putting it beside the bed. That placement reduces the chance of switching it off automatically while only half awake.

Common questions

What happens if my laptop goes to sleep before 8:51 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.

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.