Set the alarm clock for 4:35 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 4:33 am Alarm clock for 4:34 am Alarm clock for 4:36 am Alarm clock for 4:37 am

Going to bed for a 4:35 am alarm

Asleep by 7:20 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:50 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:20 pm — 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.

4:35 am across the country

London	4:35 am
Birmingham	4:35 am
Manchester	4:35 am
Glasgow	4:35 am
Belfast	4:35 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 watch the clock for the appointed moment, set the alarm for 4:35 am so the vote count can begin promptly after the polling stations have closed. That leaves the team working towards 5:00 am with a clear starting point, rather than relying on someone to notice the time amid sealed boxes, paperwork and late-night conversations.

A count beginning in a quiet room may suit a gentle tone that marks the moment without startling everyone, while a busy counting venue may need a more persistent sound that can be heard over movement and voices. Choose the tone with that setting in mind, then keep this page active and the computer awake. If the browser stops running beforehand, the alarm will not signal the start of the vote count, so use a separate backup if the timing cannot be missed.

Because 4:35 am falls deep in the night, consider who else in the house could hear the alarm while you wait for counting to start. Lower the volume if they are sleeping nearby, place the computer close enough for you to hear it, and avoid leaving it against a shared wall. A brief test beforehand can reveal whether the chosen tone reaches you without waking the whole household.

Common questions

What happens if my laptop goes to sleep before 4:35 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.