How to use the online alarm clock
Getting ready at 11:39 pm gives you time to catch the last suburban train without turning the journey into a platform sprint. Set the alarm before packing your bag, checking the departure board and putting your ticket, Oyster card or contactless card somewhere easy to reach. With 12:00 am approaching, choose a warning time that leaves enough room to walk to the station and find the correct platform.
For a last-train departure, an alarm you cannot hear offers little protection against losing track of the evening. Check that silent mode, volume settings and any focus setting will allow the alert to make a sound, then play a brief test while you are still preparing. Do not rely on this browser alarm as your only safeguard: if the browser is no longer active or the phone goes to sleep, no sound may warn you, and the train could leave without you.
Once your route home is settled, keep the rest of the evening simple so the alarm does not lead into another long spell of activity. Put anything needed after the journey within reach before leaving, and avoid starting tasks that can stretch beyond 11:39 pm. That preserves more of the sleep available after midnight instead of using it on avoidable sorting when you get home.
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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