Set the alarm clock for 3:15 am

 

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

The alarm goes off in: ::
 
 

Going to bed for a 3:15 am alarm

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

3:15 am across the country

London3:15 am
Birmingham3:15 am
Manchester3:15 am
Glasgow3:15 am
Belfast3:15 am

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

Online alarm clock for 3:15 am

While you are halfway through clearing glasses and checking the till, a 3:15 am alarm gives you a firm cue to break away and close the bar within the terms of its evening licence. It leaves enough time before 4:00 am to secure the premises, finish the required checks and make sure nobody is still inside.

During a noisy bar close, the alarm may sound through headphones that you have forgotten are connected, leaving the room itself silent. Check the audio destination before relying on it, set the volume clearly above the background noise and keep the headphones where you will notice them. A browser alarm cannot safeguard the bar closing if you close the page or let the phone or computer go to sleep, so use a separate alarm as a fallback when the licence deadline cannot be missed.

Once the main lights are lowered for the night, repeated glances at a bright screen can make keys, notices and dark corners harder to see immediately afterwards. Keep the display dim but readable, use a warmer colour setting if available, and place it away from direct reflections. At 3:15 am, one clear check of the alarm is more practical than watching the screen throughout the remaining jobs.

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 3:15 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.