Set the alarm clock for 4:43 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 4:41 am Alarm clock for 4:42 am Alarm clock for 4:44 am Alarm clock for 4:45 am

Going to bed for a 4:43 am alarm

Asleep by 7:28 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:58 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:28 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.

4:43 am across the country

London	4:43 am
Birmingham	4:43 am
Manchester	4:43 am
Glasgow	4:43 am
Belfast	4:43 am

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

How to use the online alarm clock

You are only just waking at 4:43 am, with the Belfast ferry collection in Liverpool still ahead of you. Take a moment to get properly alert, check the arrival details and gather anything needed for the pickup. By 5:00 am, you can be dressed and ready to leave without turning the start of the journey into a rush.

Because meeting the ferry depends on waking when planned, the alarm needs an active browser and a phone or computer that remains awake until it rings. If the browser is closed or the phone falls asleep beforehand, the ferry alarm will not sound, which could leave passengers waiting at the terminal. Keeping the page visible, connecting the charger and checking the volume before settling down reduces that risk; a separate phone alarm provides sensible backup for an early collection.

Stepping from an air-conditioned room into the Liverpool night can make the outdoor warmth feel stronger than expected, particularly after waking suddenly. Set out a light layer that is easy to remove, and allow the car to ventilate before driving if the cabin has held heat overnight. At 4:43 am, cooler air may still linger near the waterfront, while indoor air conditioning can feel surprisingly cold during a wait.

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 4:43 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.