Set the alarm clock for 6:41 am

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

The alarm goes off in: ::

You can also try the other alarm clocks

Alarm clock for 6:39 am Alarm clock for 6:40 am Alarm clock for 6:42 am Alarm clock for 6:43 am

Going to bed for a 6:41 am alarm

Asleep by 9:26 pm — 6 full sleep cycles, about 9 hours
Asleep by 10:56 pm — 5 full sleep cycles, about 7 hours
Asleep by 12:26 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.

6:41 am across the country

London	6:41 am
Birmingham	6:41 am
Manchester	6:41 am
Glasgow	6:41 am
Belfast	6:41 am

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

How to use the online alarm clock

Break away from the task in front of you when the 6:41 am alarm sounds, so you can leave for rowing training on the Thames without drifting back into what you were doing. The 19 minutes before 7:00 am give you a defined window for changing, collecting your kit and heading out, rather than watching the round hour arrive while you are still indoors.

Your departure may call for a tone that cuts through conversation, running water or the rustle of sports kit, while a gentler sound may suit a quiet household. Set the volume with that setting in mind and check that the chosen tone is clearly audible. If you close this page or allow the device to sleep, the rowing alarm cannot sound and your training departure may slip unnoticed; leave both active until 6:41 am has passed.

Leaving this early can preserve more sleep than waking at 6:30 am simply because it looks tidier on the clock. Prepare your layers, keys and water bottle before bed, then keep the final minutes after waking for getting dressed and leaving. That makes 6:41 am a deliberate boundary: late enough to retain those extra minutes in bed, yet tied to the practical time needed to reach the Thames.

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 6:41 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.