Set the alarm clock for 3:48 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 3:46 am Alarm clock for 3:47 am Alarm clock for 3:49 am Alarm clock for 3:50 am

Going to bed for a 3:48 am alarm

Asleep by 6:33 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:03 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:33 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.

3:48 am across the country

London	3:48 am
Birmingham	3:48 am
Manchester	3:48 am
Glasgow	3:48 am
Belfast	3:48 am

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

How to use the online alarm clock

Pause what you are doing at 3:48 am and get ready to leave for the National Express stop, so meeting your relative does not slip your mind. The alarm marks the point when you need to break away from the task in front of you. That still leaves a short window before 4:00 am to gather your keys, coat and any journey details.

Keep this alarm page open after setting the time, and leave the browser running while you finish what you are doing. Closing the tab or browser means the alarm cannot sound, which could leave your relative waiting beside the night bus. Check that your phone or computer will remain awake as well, then choose a volume that you can hear from where you are working.

A night-time departure can disturb other people in the house long before their own morning begins. Put your coat, keys and shoes near the door earlier, and avoid searching through drawers when the alarm sounds. A moderate alarm volume placed close to you is less likely to wake everyone than a loud signal across the room. At 3:48 am, dim the screen while preparing, then leave quietly enough to keep the household settled.

Common questions

What happens if my laptop goes to sleep before 3:48 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.

Will it still be right when the clocks change?

Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.