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 illustration day human sun morning health head life healthcare male man time clock concept icon night sleep biological balance body hour cycle daily routine activities mental chart schedule rhythm brain diagram wake stages nocturnal regulation phase awakening hormone pineal rem gland hormones hormonal serotonin infographic melatonin circadian chronobiology

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