How to use the online alarm clock
Preparing in advance for a night shift on the M25 means having boots, reflective clothing and keys ready before the alarm is needed. A 12:00 am alarm can mark the moment to leave for the roadworks, rather than the moment to start gathering equipment. That gives the departure a clear place in the evening’s plan.
Before putting the M25 kit by the door, it is worth checking where the alarm sound will play. A phone or computer may still be connected to headphones, so the alert can disappear into a pair left in a bag or on a desk. Disconnect them or test the alarm at a low volume through the intended speaker. The alarm cannot alert you for the M25 roadworks if this page has been closed or the device has fallen asleep, so a separate backup is sensible when departure cannot slip.
Your drive to the work site may take a different amount of time around midnight than it would during the day. Check the planned route before settling down, allowing for overnight closures, lane restrictions and the distance from the motorway exit to the meeting point. Keeping fuel, access details and the destination postcode together also prevents a quiet road from turning into a rushed arrival.
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 12:00 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.
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