The purpose of sleep is not to provide an interlude that coincides with the night period in order to avoid predators, it is to take advantage of the relatively unproductive night hours for the many creatures depending on vision to carry out their activities, who would be lost in the dark and might even get into a good deal of trouble not being able to see hazards as they attempt to move about, and so on. The main purpose of the sleep interval is to provide a replenishment, a rejuvenation, and a realignment of energies within the body for housekeeping purposes. This includes not only clearing many toxic materials that have built up as a consequence of physical activity and digestive processes taking place subsequent to meal ingestion, but also the metabolic by-products and waste materials that cells produce, and the body as a whole in responding energetically to its bombardment by environmental energetics like sunshine as well as the electromagnetic frequencies emitted by Gaia.
There is a high turnover of many cell types within the body. This furious activity, both on the microscopic scale as well as grossly, as with the cardiovascular system, the respiratory system, the digestive system, and the muscular system and skeletal support involved in locomotion, all exhibit wear and tear in their high metabolic activity and this includes the brain as well, as one of the most energy-intensive organs in the human body, generates quite a lot of waste material that must be carried away and then the cells restored through regaining a prior level of equilibrium with respect to being in a more pristine state in order to start anew with a round of furious activity potentially they may be called on to carry out. This is a very important clearing of the decks, so to speak, to have everything shipshape and ready for battle, so to speak.
This is well documented in the sleep deprivation studies that show what happens to humans and other organisms who are sleep deprived. It becomes extremely debilitating and this indeed is due to waste product build-up, especially in the central nervous system which necessitates a period of quiescence that allows changes to take place in the membranes lining the braincase, and the exchange with the circulation of these by-products of metabolism. So sleep is quite important for health, wellbeing, and longevity as well.
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