Set the alarm clock for 3:45 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 3:43 am Alarm clock for 3:44 am Alarm clock for 3:46 am Alarm clock for 3:47 am

Going to bed for a 3:45 am alarm

Asleep by 6:30 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:00 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:30 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.

3:45 am across the country

London	3:45 am
Birmingham	3:45 am
Manchester	3:45 am
Glasgow	3:45 am
Belfast	3:45 am

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

How to use the online alarm clock

Waking at 3:45 am gives you a quiet starting point before preparing the studio for the BBC morning broadcast. You have not begun yet, so use the first few moments to get properly awake, check what you need to take and leave yourself a clear route through the setup. By 4:00 am, you can be dressed and ready to head out rather than searching for keys or an access pass.

Because the BBC studio must be ready before the morning programme begins, set the alarm volume clearly above any overnight audio and keep the browser alarm visible while you settle down. Test the sound once, then leave the computer connected to power. If it goes to sleep before 3:45 am or the browser is closed, the alarm may not sound, which could leave the studio without enough preparation time.

For a pre-dawn journey to the BBC studio, check the route before going to bed and allow for overnight roadworks, diversions or reduced Night Tube and bus services. Roads may be quieter at this hour, but a closed junction can outweigh that advantage. Put your coat, pass and travel essentials together so the fifteen minutes before 4:00 am are available for getting out promptly rather than repacking.

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 3:45 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.