Sleep is the balm that soothes and restores after a long day. Sleep is largely driven by the bodyรขโ‚ฌโ„ขs internal clock, which takes cues from external elements such as sunlight and temperature. Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited.

Sleep accounts for one-quarter to one-third of the human lifespan. But what exactly happens when you sleep? Before the 1950s, most people believed sleep was a passive activity during which the body รขโ‚ฌยฆ

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