How to use the online alarm clock
Wrap up what you are doing and set off for the metro control point, using the 12:05 am alarm as the signal to leave and take over the shift. That gives the journey a clear starting moment rather than leaving you to keep checking the clock. With 1:00 am still ahead, there is time to arrive, put away your coat and receive the handover without treating the whole night as one vague stretch.
Your shift depends on hearing the alert, so keep this page open in the browser after setting the alarm and leave the phone or computer awake with its sound audible. If the browser is closed or the device goes to sleep, the shift alarm will not sound. Check the volume before stepping away, and avoid relying on a muted laptop across the room when you need to notice the signal promptly.
Leaving for a control point just after midnight can mean meeting damp air outside, even when the earlier evening felt dry. At 12:05 am, take a light outer layer that can handle moisture and watch for condensation around station entrances, railings and smooth paving. If the air feels close, allow a moment before entering the control room to shake off any surface damp and keep wet clothing away from consoles or paperwork.
Common questions
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 12:05 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.
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