this post was submitted on 08 Nov 2023
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I’m not sure if it’s being used in a different context, but the way that author depicted it was natural wakefulness and sleepiness. It’s a measurable phenomenon of adenosine levels and EEG waves. People have different times of the day that they are most awake or most sleepy. One theory is as an evolutionary advatage, humans can guard each other while the other is active.
And the study that is referenced had a college professor and his grad student sleep in a pitch black cave to observe how long a “day” would be with zero sunlight. The younger student had about a 25 hr day, and the middle-aged professor had about a 24.5 hr day. It showed strong evidence that lighting has a direct relationship to sleep.