Set the alarm clock for 3:05 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 3:03 am Alarm clock for 3:04 am Alarm clock for 3:06 am Alarm clock for 3:07 am

Going to bed for a 3:05 am alarm

Asleep by 5:50 pm — 6 full sleep cycles, about 9 hours
Asleep by 7:20 pm — 5 full sleep cycles, about 7 hours
Asleep by 8:50 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.

3:05 am across the country

London	3:05 am
Birmingham	3:05 am
Manchester	3:05 am
Glasgow	3:05 am
Belfast	3:05 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 3:05 am to meet the last train at the station means starting gently but moving with purpose. Give yourself a moment to become fully alert, then check the departure board or saved timetable and allow for the walk, drive or night bus. With 4:00 am approaching, those 55 minutes can cover getting dressed, gathering your keys and reaching the platform without a frantic dash.

Your station journey depends on hearing the alarm, so leave this page open and keep the phone or computer awake with the sound turned up. If the browser is closed or the phone falls asleep, the alarm may not sound, leaving you unaware that the last train is nearing the station. A mains connection can also prevent a low battery from ending the session before 3:05 am.

Before heading towards the station in the middle of the night, have a small drink of water and choose something light if you are hungry, such as toast, a banana or a few biscuits. A large meal can wait until the journey is under way or morning services have opened. Pack a sealed drink rather than carrying an open cup across a dark pavement or along the platform.

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 3:05 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.