Production of melatonin and serotonin hormones at night and day. Pineal gland anatomy, the human brain poster. Circadian rhythm concept. Sleep wake cycle infographic flat vector illustration. premium vector by Pikovit

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vector graphic illustration day human sunlight sun morning health life healthcare time clock icon night sleep biological lifestyle balance body hour cycle everyday daily routine mental chart schedule rhythm anatomy brain diagram wake stages nocturnal regulation phase awakening hormone pineal rem gland hormones hormonal serotonin infographic melatonin circadian chronobiology

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