But even with that extra time, I found that I’d load my mornings with way too many expectations — plans to journal, stretch, meditate, tidy up, respond to emails, and maybe even sneak in a walk.

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Within the hypothalamus is the suprachiasmatic nucleus (SCN), a key regulator of the circadian timing system (CTS). Communication between light and the SCN is facilitated by the retinohypothalamic ...