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In general, the sleep cycles respect the circadian regulation of the human organism, as they start every 24 hours. Luminosity during the day, darkness at night, and the variations in light incidence throughout the day are transported by the optic nerve and stimulate the supra-chiasmatic nucleus in the anterior hypothalamus to produce melatonin, a neurohormone implicated in the chronobiology of the sleep-wake cycle. From this point, a somnolence situation starts which results in physiological sleep when there is no other factor disturbing this cycle [1].

The Influence of Sleep Disorders, Sleep Habits, Comorbidities on the Sleep Quality of Medical Students and the Consequences of these Findings