How to use the online alarm clock
Waking at 2:13 am to check the heating in an old stone house calls for a quiet moment before getting out of bed. Let your eyes adjust, find a dressing gown and slippers, then listen for unusual pipe or boiler noises. The alarm leaves 47 minutes before 3:00 am, enough time to inspect cold rooms without rushing.
Because this heating check depends on a browser alarm, keep the page open and the computer or phone awake until it sounds. Closing the page or letting the screen’s host device sleep may mean the heating inspection never begins. Set the volume beforehand, disconnect headphones if they are not being worn, and place the device close enough to hear without disturbing the whole house.
A middle-of-the-night inspection is easier with a small drink of water ready beside the bed. If something warm would help after walking through chilly rooms, prepare tea once the checks are finished rather than carrying a hot mug around dark stairs. Leave a full meal until morning; a plain biscuit is a practical option if hunger would otherwise distract from checking radiators and exposed pipes carefully.
Common questions
What happens if my laptop goes to sleep before 2:13 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.
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.
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