Set the alarm clock for 8:41 am

 

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

The alarm goes off in: ::
 
 

Going to bed for a 8:41 am alarm

  • Asleep by 11:26 pm — 6 full sleep cycles, about 9 hours
  • Asleep by 12:56 am — 5 full sleep cycles, about 7 hours
  • Asleep by 2:26 am — 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.

8:41 am across the country

London8:41 am
Birmingham8:41 am
Manchester8:41 am
Glasgow8:41 am
Belfast8:41 am

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

How to use the online alarm clock

As you hand responsibility for the Snowdon sunrise meet-up to the person taking over, set the alarm for 8:41 am and pass on the agreed plan. That gives them a clear cue for checking the route, gathering the group or confirming the final details before 9:00 am, without relying on a hurried message from you later.

The summit handover is safer if you hear the alarm once before leaving it to do its job. Set a temporary signal, check that its tone is distinct and loud enough, then reset it for 8:41 am; this also reveals muted audio or sound routed somewhere unexpected. A closed browser page or a sleeping phone or laptop cannot play the alert, which could leave the Snowdon summit party waiting while the sunrise window passes.

Whoever takes over the early ascent should expect exposed kit to feel damp even when rain is not falling. At 8:41 am, cool, humid air can leave gloves, straps and phone screens clammy, so keeping the phone in a zipped inner pocket helps preserve a clear screen for checking the alarm and route. A light outer layer that can be opened during the climb also handles the change from sheltered paths to moving air higher up.

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 8:41 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.