Set the alarm clock for 5:40 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 5:38 am Alarm clock for 5:39 am Alarm clock for 5:41 am Alarm clock for 5:42 am

Going to bed for a 5:40 am alarm

Asleep by 8:25 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:55 pm — 5 full sleep cycles, about 7 hours
Asleep by 11:25 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.

5:40 am across the country

London	5:40 am
Birmingham	5:40 am
Manchester	5:40 am
Glasgow	5:40 am
Belfast	5:40 am

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

How to use the online alarm clock

Before handing the Dover ferry screening over to the next driver, set the alarm for 5:40 am so the changeover does not drift into the final preparations. That leaves a clear point for passing across tickets, vehicle details and any notes about the crossing, with 6:00 am still available as a simple reference for the next stage.

Because the alarm is needed during a handover, check that the phone will remain awake until it sounds and leave the browser page open. If either is shut down beforehand, the alarm may remain silent and the Dover ferry screening handover could be missed. Set the volume at a level both drivers can hear, then confirm that the displayed alarm time is 5:40 am before putting the phone somewhere visible rather than beneath paperwork or luggage.

Once the next driver takes responsibility, the road towards Dover may be quieter at this early hour, but journey time should still include the approach to the port, signs for the correct terminal and possible queues near screening. A route estimate checked shortly before departure is more useful than one saved the previous evening, since overnight closures can alter the final stretch. Keeping a small margin also avoids turning the drive into a rush if the handover takes longer than expected.

Common questions

Can I use this on a phone?

It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.

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 5:40 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.