Set the alarm clock for 4:46 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 4:44 am Alarm clock for 4:45 am Alarm clock for 4:47 am Alarm clock for 4:48 am

Going to bed for a 4:46 am alarm

Asleep by 7:31 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:01 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:31 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.

4:46 am across the country

London	4:46 am
Birmingham	4:46 am
Manchester	4:46 am
Glasgow	4:46 am
Belfast	4:46 am

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

How to use the online alarm clock

With the tide checked, finish packing away your notes and set the alarm for 4:46 am before heading out to the fishing boat. That leaves a clear prompt before 5:00 am, so the final few preparations do not quietly stretch beyond the planned departure. Keep the departure time in mind while securing anything that could shift once the boat is under way.

As you leave the tide table behind, check where the alarm sound will actually play. Wireless headphones may still be connected even after they have been put in a pocket or bag, making the alert easy to miss on the quay. Disconnect them or select the phone or computer speaker, then test the volume briefly. Keep this page active and the screen awake; otherwise the alarm may remain silent and leave the boat’s departure without its prompt.

A harbour can still be very dark at 4:46 am, particularly away from street lighting, so arrange the light before completing the tide check. Put a charged torch where it can be reached with one hand, rather than buried beneath waterproofs, and switch on only the light needed for the immediate task. Dim the screen after setting the alarm to preserve visibility beyond its glow, while leaving enough brightness to confirm that the alarm remains ready.

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 4:46 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.