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The Circadian Classroom

Zaid K. Dahhaj
Hundreds of paid subscribers

Your doctor is afraid of the sun. I'm not. Circadian biology from first principles to fix your sleep, energy, skin, and relationship with full spectrum sunlight

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Substack
PricingFreemiumPublishesDaily
Issues368Founded4 years agoLast Issue3 days ago
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Latest Issues

Why Circadian Alignment Is the Foundation of a Developing Child

A child is not born with a fully mature circadian clock system. Make no mistake about this though, the machinery is there. The suprachiasmatic nucleus, or master circadian clock, is anatomically formed before birth but functionally immature...

3 days ago
12
3

“I’m Not A Science Person”

When people tell me why they haven’t started the 80/20 Circadian Course yet, I hear the same four reasons.

You have four days left at $196, so here are my honest answers.

1. “I’m not a science person.”

Good. I built the course for you....

4 days ago
6
2

Why Fall Leaves You Tired All Day & Wired At Night

You’ve probably felt it already.

You wake up groggy after a full night in bed. Your energy drops off a cliff mid-afternoon. By evening you’re wired and can’t fall asleep. Your mood feels a shade grayer, and you can’t really say why.

Most...

15 days ago
17
6

Albinism and the Sun: A Circadian Perspective

The Short Answer

Albinism is the clearest case where the circadian sun message has a hard boundary. Every circadian benefit of sunlight stays available to people with albinism, but UV on bare skin does not.

A second degree burn, for...

16 days ago
12

The Solar Adaptation Framework

The Solar Adaptation Framework: A progressive overload protocol for UV, built from circadian first principles, for every skin type from red hair to deep eumelanin

I’ve written a few articles on the concept of a “solar callus,” which just r...

a month ago
31
8
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  • Zaid K. Dahhaj

    Your doctor is afraid of the sun. I'm not. Circadian biology from first principles to fix your sleep, energy, skin, and relationship with full spectrum sunlight.

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