Set the alarm clock for 3:00 am

 

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::
 
 

Going to bed for a 3:00 am alarm

  • Asleep by 5:45 pm — 6 full sleep cycles, about 9 hours
  • Asleep by 7:15 pm — 5 full sleep cycles, about 7 hours
  • Asleep by 8:45 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.

3:00 am across the country

London3:00 am
Birmingham3:00 am
Manchester3:00 am
Glasgow3:00 am
Belfast3:00 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 when the alarm sounds and get ready to leave for the fish auction in Newlyn. A 3:00 am alert gives the change of activity a clear boundary: finish the immediate task, gather your keys and paperwork, then head out rather than letting another job delay your departure.

Because auction preparations can involve running water, an extractor fan or equipment being moved, set the alarm volume high enough to stand out against the noise around you. Place the phone nearby but away from anything likely to muffle its speaker, and test the sound before returning to your work. This browser alarm cannot signal for the auction if the page is no longer active or the phone has gone to sleep, so keep it awake and leave the alarm open until it rings.

Leaving for Newlyn in the middle of the night usually means quieter roads, but that should not become a reason to set off late. Check the likely journey time before settling back into your task, then allow a margin for mist, narrow Cornish lanes or slow vehicles near the harbour. At 3:00 am, keep your keys and outer layer together so departure takes only a moment.

Common questions

What happens if my laptop goes to sleep before 3:00 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.