>>54040394That's just women.
>>54044700Not just in primitive savage "natives"; this practice of the double sleep was quite possibly the standard, normal way in civilised man as well as per journal entries and other such accounts from dating from at least the 18th attest. It was such a regular, mundane fact of life that it wasn't notable enough to record amongst must who were capable of doing so.
Electric light, on demand, destroyed this natural cycle of the double-sleep.
Live in the woods and sleep when it gets dark, with perhaps only a campfire for illumination, and you'll fall back into this primordial rythm.