Set the alarm clock for 4:06 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 4:04 am Alarm clock for 4:05 am Alarm clock for 4:07 am Alarm clock for 4:08 am

Going to bed for a 4:06 am alarm

Asleep by 6:51 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:21 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:51 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.

4:06 am across the country

London	4:06 am
Birmingham	4:06 am
Manchester	4:06 am
Glasgow	4:06 am
Belfast	4:06 am

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

How to use the online alarm clock

As the late West End performance finishes, set the 4:06 am alarm before leaving to collect the crew. That gives the departure a fixed point while bags, keys and final messages are being sorted. With 5:00 am still ahead, there is no need to keep checking the clock during those last jobs.

Because this pickup depends on one early signal, test the sound now rather than discovering a problem when it is time to leave. Set a trial alarm a minute ahead, raise the volume to a clear level and check that silent mode or headphones will not hide it. Then reset it for 4:06 am and keep the browser running. This browser alarm cannot sound for the crew collection after the browser has been closed or the phone or computer has fallen asleep, so use a separate alarm if that might happen.

Leaving a theatre for a car at this hour can feel unexpectedly warm during a summer hot spell, even though it is still night. Put water in the car before departure and start the air conditioning gently instead of aiming a cold blast at tired passengers. A moderate cabin setting also keeps the windscreen clearer when warm street air meets cooler glass.

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 4:06 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.