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Melatonin and adenosine reach peak levels around midnight/bedtime. I was wondering what other molecules also buildup as the day progresses. Particularly molecules that affect the CNS and/or immune system.

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  • $\begingroup$ Welcome to Biology SE. Your question might be better received if you provide citations to the claim about peak levels of melatonin and adenosine around bedtime. $\endgroup$ – Galen May 1 at 5:43

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