How to use the online alarm clock
As you hand over responsibility for getting everyone through Heathrow security before an early flight, set the alarm for 8:05 am so the next person has a clear cue to take charge. That leaves the journey moving while tickets, passports and cabin bags change hands. With 9:00 am approaching, the signal marks a practical checkpoint rather than another time to remember amid the departure routine.
Against airport announcements, rolling suitcases and conversation, a quiet signal can disappear into the background. Set the browser alarm’s volume high enough to be distinct, then play a brief test before relying on it. Keep the speaker uncovered and avoid leaving the phone inside a packed bag. Closing the alarm page or allowing the phone or laptop to sleep means the early flight handover may receive no sound at all, so use a separate alarm if nobody will keep the browser active.
Once the 8:05 am handover is complete, decide whether the remaining early-morning journey offers any realistic chance to rest. If someone else is navigating the terminal, keep a neck pillow or folded jumper accessible and agree where they will wake you. A short rest before boarding is easier when passports and the gate details remain with the person now in charge.
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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