Online alarm clock for 12:39 am
As you hand the generator check to the next person at the DOC hut, set the alarm for 12:39 am so the changeover has a clear checkpoint. That leaves the incoming shift 21 minutes before 1:00 am to inspect fuel, ventilation and any warning lights without letting the task drift into the next hour.
For this generator handover, enter 12:39 am and check that the displayed alarm matches the intended time before relying on it. Keep the browser alarm visible and the phone awake until it rings; if the phone sleeps first, the generator check may receive no alert. Lower the screen brightness, but avoid any power-saving setting that suspends the browser before your relief is due.
After passing on the generator notes, settle back into your bunk with everything needed for morning already beside you. At this point in the night, searching for boots, a torch or warm layers after the alarm can cut further into the sleep remaining. Keep the hut quiet, dim the screen once the alarm is set, and leave the next person a brief written note rather than another conversation.