Sleep is a complicated process that can be thought of as an “active unconsciousness.” While the exact purpose of sleep has not been fully elucidated, it is thought to aid in homeostasis, memory retention, and more. The mechanism through which sleep is generated and maintained is more of a balance between two systems located within the brain: the homeostatic processes, which are functionally the body’s “need for sleep” center, and the circadian rhythm, which is an internal clock for the sleep–wake cycle.
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Es una muy buena clase, el tema se entiende muy bien.