Online alarm clock for 12:43 am
As you hand the Canterbury lambing check over to the next person, set the alarm for 12:43 am so the change of watch does not blur into a missed shed or paddock visit. It gives the incoming person a clear cue before 1:00 am, while you can pass on which ewes need attention and where the torch, coat, and notes are.
A farm can be noisy even after midnight, with rain on a roof, dogs shifting, a heater running, or gear being moved. Set the alarm volume high enough to stand out, then test it from the place where the next person will wait. Keep the browser running and the computer awake: otherwise the alarm will not sound, leaving the lambing check without its planned prompt. If background noise changes, check the level again rather than assuming the earlier test still applies.
Once the handover is complete, make the remaining night easier to sleep through by leaving no loose details to remember. Write down the ewe numbers, paddock location, and next check beside the gear before stepping away. At 12:43 am, dim bright lights after the farm task and keep the route back indoors simple, so the sleep still available afterwards is less disrupted by searching for keys or replaying instructions.