Set the alarm clock for 5:07 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 5:05 am Alarm clock for 5:06 am Alarm clock for 5:08 am Alarm clock for 5:09 am

Going to bed for a 5:07 am alarm

Asleep by 7:52 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:22 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:52 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.

5:07 am across the country

London	5:07 am
Birmingham	5:07 am
Manchester	5:07 am
Glasgow	5:07 am
Belfast	5:07 am

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

How to use the online alarm clock

Hand the rock-pool outing over at 5:07 am with the meeting point, tide details and kit already agreed, so the next person can leave without retracing your planning. An alarm set for this exact time gives the changeover a clear boundary, while 6:00 am remains a useful fallback for anyone joining the search later.

Your replacement needs the alarm to remain dependable while checking the route or packing buckets and waterproofs. Keep the browser open after setting it and leave the computer or phone awake, with the volume high enough to hear from across the room. If you close the browser or let the equipment sleep, the alarm may never sound and the rock pools could be reached after the intended departure. A separate phone alarm is a sensible backup when another person relies on the handover.

Before passing responsibility across, allow for the road rather than treating 5:07 am as the departure itself. Early traffic is often light, but narrow coastal lanes, temporary roadworks and a final walk from the car park can still absorb time. Check the likely journey length, add a small margin for finding the agreed entrance in the dark, and give the incoming person one realistic leave-by time.

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 5:07 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.