Online alarm clock for 2:45 am
Finish what you are doing, set the alarm for 2:45 am, and leave your phone ready for the international call timed to Britain. That gives you a clear cue to wrap up sleep or a late task before speaking. If the conversation begins closer to 3:00 am, the alarm still leaves a short window to get settled and check the number.
Because you plan to step away after setting it, keep the browser open and your phone awake enough for the alarm to run. Closing the browser or letting the phone sleep may silence the alert, which could mean missing the international call. Set the volume before leaving, confirm that the alarm appears active, and keep the phone connected to power if its battery is running low.
Before a 2:45 am call in New Zealand, decide whether you will stay indoors or take a brief step outside to wake up. Overnight air can feel damp, especially in coastal parts of the country, so leave a light layer nearby and avoid placing the phone where moisture can reach it. A few quiet breaths by an open doorway may feel more comfortable than walking far along a dark street.