Set the alarm clock for 3:13 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 3:11 am Alarm clock for 3:12 am Alarm clock for 3:14 am Alarm clock for 3:15 am

Going to bed for a 3:13 am alarm

Asleep by 5:58 pm — 6 full sleep cycles, about 9 hours
Asleep by 7:28 pm — 5 full sleep cycles, about 7 hours
Asleep by 8:58 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.

3:13 am across the country

London	3:13 am
Birmingham	3:13 am
Manchester	3:13 am
Glasgow	3:13 am
Belfast	3:13 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 wait to check the lambing on your Yorkshire farm, set the alarm for 3:13 am and keep an eye on the clock without repeatedly unlocking your phone. The alert marks the moment to pull on your boots and head out, while 4:00 am remains a useful reference point for the next planned check or handover.

Your lambing check depends on the browser staying active until the alarm sounds. If you close the page or quit the browser, the alert will not happen; if the phone or computer goes to sleep, it may also fail to mark 3:13 am. Leave the alarm page open, keep the equipment awake and set the volume before settling down to wait. A separate alarm clock is sensible when missing the check could leave the ewe unattended.

Moving through the house at 3:13 am can wake anyone sleeping nearby before you even reach the yard. Put clothes, keys and a torch together downstairs earlier in the evening, and avoid switching on landing lights or searching through cupboards. Keep the alarm volume only as loud as needed from your waiting spot, then silence it promptly before leaving for the lambing shed.

Common questions

What happens if my laptop goes to sleep before 3:13 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.