How to use the online alarm clock
You are waking at 2:12 am, with the journey to Stonehenge still ahead and the solstice sunrise as your reason for leaving the duvet. Settle your eyes, check the weather and gather the clothes or flask prepared earlier. Getting up now leaves a useful margin before 3:00 am, so a misplaced key or slower-than-expected start need not derail the plan.
A quiet house at this hour calls for an alarm tone that fits both you and the people nearby. Choose a gentle sound if you wake easily and want to avoid jolting anyone in the next room; use a more persistent tone if you commonly silence an alarm while half-awake. Set the volume before relying on it, then leave this page active and the phone awake: otherwise the Stonehenge alarm will not sound when you need to leave.
Before heading towards the stones, decide how much sleep you want to preserve after 2:12 am. If this alarm is only an early check, keep the room dark, avoid lingering over messages and set a separate later alarm before lying down again. If you are getting up for the day, place warm layers within reach so the remaining sleep is not lost to searching around a cold, dark room.
Common questions
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.
What happens if my laptop goes to sleep before 2:12 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.
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