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On Sleep And Sleeplessness   

When this has taken place animals awake from sleep, being released

from the heaviness consequent on taking food. We have now stated the

cause of sleeping, viz. that it consists in the recoil by the

corporeal element, upborne by the connatural heat, in a mass upon

the primary sense-organ; we have also stated what sleep is, having

shown that it is a seizure of the primary sense-organ, rendering it

unable to actualize its powers; arising of necessity (for it is

impossible for an animal to exist if the conditions which render it an

animal be not fulfilled), i.e. for the sake of its conservation; since

remission of movement tends to the conservation of animals.


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