Set the alarm clock for 3:55 am

 

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::
 
 

Going to bed for a 3:55 am alarm

  • Asleep by 6:40 pm — 6 full sleep cycles, about 9 hours
  • Asleep by 8:10 pm — 5 full sleep cycles, about 7 hours
  • Asleep by 9:40 pm — 4 full sleep cycles, about 6 hours

A sleep cycle runs about 90 minutes, and most people take around 15 minutes to drop off. Waking at the end of a cycle feels easier than waking in the middle of one.

Online alarm clock for 3:55 am

As you hand the Tekapo telescope setup to the next observer at 3:55 am, set this alarm to mark the final checks before 4:00 am. Five minutes is enough to explain the current target, point out any adjustments still needed, and confirm who will take over each task. The alert gives the changeover a clear boundary without interrupting the quiet of the observing site too early.

While preparing the telescope, check whether your phone or computer is set to silent, since that setting may suppress the alarm even when the page appears ready. Choose an audible alert, raise the volume to a practical level, and test it briefly before returning to the equipment. Keep the browser alarm running and the computer awake; if either stops, the telescope handover will receive no warning sound.

Before leaving the observing area in the dark hours, allow a small buffer between the 3:55 am alert and whatever comes next that day. Use it to pack loose accessories, note the last observation, and check the route away from the telescope without rushing. Around Tekapo, darkness and cold can make a hurried transition awkward, so reserving those few minutes helps the next commitment begin with the previous task properly finished.