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.

How to use the online alarm clock

Preparing to close the bar after the final customer’s drink means setting the 3:15 am alarm before the late shift becomes busy. It gives the closing team a clear marker for starting the last checks, with enough room to finish the planned routine before 4:00 am rather than relying on someone to notice the clock.

Because the alarm will matter during a noisy part of the shift, a quick advance test can confirm that its signal is audible above conversation, glass washing and background music. Set a near-term trial, check the volume, then leave the real alarm at 3:15 am. The alarm cannot support the bar’s closing routine if this page is dismissed or the phone is allowed to sleep, so a separate clock or staff reminder is sensible when missing the signal would delay locking up.

Closing work at this hour feels easier when the change from customer lighting to task lighting is planned beforehand. Keeping the main room bright while tills, tables and doors are checked reduces the temptation to overlook a dim corner. Once those jobs are complete, lowering the lights in stages can mark which areas have already been cleared and leave the exit route visible for everyone heading home through the dark British night.

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.