How to use the online alarm clock
Finish what you are doing and leave for Euston when the 9:39 pm alarm sounds, so you have a clear cue to meet the Caledonian Sleeper. With 21 minutes before 10:00 pm, there is enough room to collect your things, check the platform display and reach the concourse without treating the round hour as your departure signal.
Keep the alarm where you can hear it while you prepare to meet the train, particularly if your phone or laptop is connected to headphones. Sound can be routed to them without an obvious warning, leaving the room itself silent, so confirm the output and volume with a brief test beforehand. This browser alarm cannot safeguard the train meeting if its page is no longer running or the computer has gone to sleep; use a separate alarm if you might shut everything down before leaving.
As you approach Euston late in the evening, allow for the surrounding noise to change from busy streets and station announcements to quieter platforms. A tone that seemed loud indoors may be easy to miss on the Underground or concourse, while an unnecessarily sharp alert can draw attention once the station settles. Keep the handset accessible rather than buried in a bag, and choose a volume you can recognise amid the remaining passenger traffic.
Common questions
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.
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.
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