Set the alarm clock for 3:46 am

 

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

The alarm goes off in: ::
 
 

Going to bed for a 3:46 am alarm

  • Asleep by 6:31 pm — 6 full sleep cycles, about 9 hours
  • Asleep by 8:01 pm — 5 full sleep cycles, about 7 hours
  • Asleep by 9:31 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.

3:46 am across the country

London3:46 am
Birmingham3:46 am
Manchester3:46 am
Glasgow3:46 am
Belfast3:46 am

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

How to use the online alarm clock

Getting ready in advance for the Belfast ferry’s arrival means setting the 3:46 am alarm while the plan is still clear. It marks the point to stop resting, gather what you need and prepare for Liverpool. By 4:00 am, you can be moving through those final checks instead of searching for essentials at the last moment.

Meeting a ferry may involve engine noise, ventilation or other people moving nearby, so the alarm needs enough volume to remain distinct. A sharp tone can carry through steady background sound more clearly than a gentle one; a brief test at the chosen level shows whether it disappears into the room. The Belfast ferry arrival could be missed if the browser page is no longer open or the phone or laptop goes to sleep, because the alarm cannot then sound. A separate backup suits a journey with little room for delay.

Preparing for Liverpool during the night is easier when the lighting has already been arranged. A dim lamp beside your things avoids sudden glare at 3:46 am, while a brighter light near the door helps with final checks before leaving. Keeping curtains closed and the main ceiling light off can also avoid disturbing anyone else nearby.

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 3:46 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.