Changes

==== Sleep regulation (verse 39-43) ====

==== Sleep regulation (verse 39-43) ====

It is presumed that the sleep physiology is controlled by the hypothalamus and the suprachiasmatic nucleus (SCN) in the brain, which regulates mechanism of homeostatic and circadian rhythm respectively of the body. The actual mechanism of the physiology of sleep is still evolving in biomedical sciences. The sleep is initiated and begins by projections from the SCN to the brain stem. Borbely called projections as Process S (homeostatic) and Process C (Circadian) respectively, who first proposed these two process models in 1982. He pointed out that maximum sleep is the outcome of significant differences between homeostatic and circadian rhythm. [74] 

It is presumed that the sleep physiology is controlled by the hypothalamus and the suprachiasmatic nucleus (SCN) in the brain, which regulates mechanism of homeostatic and circadian rhythm respectively of the body. The actual mechanism of the physiology of sleep is still evolving in biomedical sciences. The sleep is initiated and begins by projections from the SCN to the brain stem. Borbely called projections as Process S (homeostatic) and Process C (Circadian) respectively, who first proposed these two process models in 1982. He pointed out that maximum sleep is the outcome of significant differences between homeostatic and circadian rhythm.<ref name=ref74>Saper, Clifford B.; Scammell, Thomas E.; Lu, (Jun (27 October 2005)): "Hypothalamic regulation of sleep and circadian rhythms". Nature437 (7063): 1257–1263. doi:10.1038/nature04284. PMID 16251950.</ref>

==== Effects of sleep (verse 36-38 and 44-49) ====

==== Effects of sleep (verse 36-38 and 44-49) ====