How to use the online alarm clock
You have only just woken, so set the 8:45 am alarm before checking bags, documents or the route to Heathrow. It creates a clear point to get out of bed and begin preparing for security ahead of an early flight. With 9:00 am approaching, those fifteen minutes are enough to wash, dress and confirm that your passport and boarding pass are together.
Your Heathrow departure depends on the alarm sounding while you are still getting ready, so leave the browser active and keep the phone or computer awake. If the browser is closed or the device falls asleep first, the alarm cannot sound, which could reduce the time available for airport security. Keep the volume audible, check that silent mode will not suppress the alert, and use a mains connection if the battery is running low.
While the household may still be quiet at 8:45 am, place the alarm close enough for you to hear without making it unnecessarily loud. A moderate volume and a short tone can mark the moment without waking people in nearby rooms. Prepare clothes and luggage away from sleeping family or housemates, then leave shared spaces quietly as you start the journey to Heathrow.
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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