Daylight exposure anchors circadian rhythms

547. If you've ever followed every sleep rule in the book and still found yourself wide awake at 2 a.m., this episode is for you. Sleep psychologist Dr. Jade Wu looks at why sleep hygiene—like avoiding screens or caffeine—is a great foundation but won't actually fix a "cavity" like chronic insomnia. She looks at why rigid rule-following can create the very anxiety that keeps you awake.

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