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The Circadian Classroom

Zaid K. Dahhaj
Hundreds of paid subscribers

Circadian biology from first principles. Fix your sleep, metabolism, and energy without drugs or confusion.

Platform
Substack
PricingFreemiumPublishesDaily
Issues362Founded4 years agoLast Issue3 days ago
Active

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Latest Issues

The Circadian System Is Far More Sensitive to Light at Night Than Your Eyes Make It Seem

Human beings evolved under an extraordinarily predictable environmental rhythm where we received bright, spectrally rich days followed by nights in which the retinal light signal fell dramatically.

Modern life has inverted that relationshi...

3 days ago
33
2

Your Morning Light is Disappearing. Fix it Now

Every week, the sun rises later and sits lower.

Your morning light gets weaker right when your circadian clock system needs it most.

On November 1st, the clocks fall back across the United States and sunset drops another hour. The darkest...

7 days ago
12
8

How Sunlight Exposure Influences the Growth and Length of the Developing Eye

Circadian eyesight regeneration is a sub-topic which represents the cutting edge of my focus on circadian first principles. We tend to think of sunlight and circadian biology in terms of the brain where light enters the eyes, signals the br...

11 days ago
26
4

The Slide Doesn't Know What Caused the Damage

Dermatology’s favorite piece of evidence for photoaging is a microscope slide.

Histology is the study of tissue at the microscopic level. You take a thin slice of skin, stain it, and examine the structure of its cells and fibers under mag...

15 days ago
9

Your Circadian Health Is Written in Light

We talk about sunlight constantly in the world of circadian biology. Get outside in the morning. See the sunrise. Get plenty of daylight. Spend time outdoors. Pay attention to UV. Get your skin adapted to the sun through progressive overloa...

16 days ago
23
7

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  • Zaid K. Dahhaj

    A dermatologist’s worst nightmare.

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