sleep wake cycle |
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| navigate by keyword : circadian cycle rhythm sleep chart cortisol brain melatonin serotonin night health clock day life schedule routine diagram wake chronobiology infographic human time biological mental healthcare regulation rem phase hormone stages vector daily illustration morning nocturnal balance icon sun awakening hour hormonal anxiety awake graph midnight noon afternoon graphic maximum |
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| Circadian rhythm infographic poster. Melatonin and cortisol are produced in human brain. Colorful diagram of circadian cycle. Night day life balance. Sleep wake cycle chart flat vector illustration. |
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