How to use the online alarm clock
Waking at 3:58 pm for an NHS blood donation means the day has to begin with the appointment already close. Let the alarm bring you fully round, then check the time, collect anything prepared earlier and get your bearings before setting off. With 4:00 pm arriving almost immediately, there is little room for drifting back under the duvet.
Your blood donation depends on hearing the alert, so test the sound now, while there is still time to correct a muted browser or low volume. Set a trial alarm for the next minute and listen for it from where you are resting. Leaving this page or allowing your phone to sleep silences the browser alarm, which could make you late for the NHS blood donation; keep the page open and the phone awake until it rings.
Getting up for a late-afternoon donation can feel abrupt if the room has become warm while you slept. If air conditioning has been running, set it to a comfortable level before resting so you do not wake chilled and linger indoors; if the room is stuffy, allow a few moments to cool down and dress for the temperature outside. At around 4:00 pm, indoor coolness can disguise a hot afternoon, so check the weather before choosing an extra layer.
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.
Cookie policy