How to use the online alarm clock
Mid-task preparations can make 4:31 am easy to miss when you need to break away and leave for overnight roadworks on the M25. Setting the alarm for that exact time creates a clear boundary between checking equipment, paperwork or travel details and getting out of the door. It also leaves a defined 29-minute window before 5:00 am for reaching the agreed access point or reporting to the crew.
Roadwork kit can be ready while the phone remains silent, so the alarm sound should be checked before relying on it. The browser may appear to run normally even when the handset is set to silent; raising the media volume and testing a brief alarm helps confirm what will actually be heard. This alarm cannot alert you if its page has been dismissed or the handset has suspended it, which could make the M25 roadworks departure late, so a separate phone alarm is a sensible backup.
Leaving at this point in the night can split a short rest into two awkward parts. Clothes, keys and work gear placed together beforehand reduce how long 4:31 am keeps you awake. After the shift or departure task, keeping the room dim and avoiding unnecessary screen time can preserve more of the sleep still available before the morning begins.
Common questions
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.
Will it still be right when the clocks change?
Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.
Can I use this on a phone?
It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.
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.
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