Reletter
Artwork for The Circadian Classroom

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
Issues364Founded4 years agoLast Issue15 days ago
Active

Read this Newsletter

zaidkdahhaj.substack.com
Artwork for The Circadian Classroom

Latest Issues

The Solar Adaptation Framework

I’ve written a few articles on the concept of a “solar callus,” which just refers to a tan. You can refer to my second most recent below. I consider this article below one of my favorites because it walks you through the progressive magic o...

15 days ago
29
8

What Every Pre-Modern Culture Knew About Light and Healing

Every civilization that left written records also left a record of sun worship.

Modern dermatology treats this as superstition, a primitive reflex that science eventually corrected. The opposite is true. Pre-modern cultures observed somet...

18 days ago
29
4

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...

a month ago
42
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...

a month ago
13
8

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

2024 research connects seasonal light exposure, pupil biology, retinal dopamine, and the length of the developing eye

Circadian eyesight regeneration is a sub-topic which represents the cutting edge of my focus on circadian first principle...

a month ago
27
4
Paid

Key Facts

Contact Information
Newsletter Author
Number of Subscribers
Find out how many people subscribe to this newsletter.

Audience Metrics

Subscribers, engagement, traffic and sponsorship for The Circadian Classroom.

SubscribersEngagement83Monthly Web Visits
Accepts SponsorsEstimated Cost per Ad

SEO Reach

Where The Circadian Classroom ranks on Google, and how much search traffic it brings in.

Ranked Keywords105Monthly Search TrafficTop Keywords

Chart Rankings

How this newsletter ranks in the official Substack charts.

Authors

The writers behind this newsletter.

  • 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.

  • Frequently Asked Questions

    How can I access the email archive for The Circadian Classroom?

    You can find recent issues that have been published by The Circadian Classroom on Reletter by scrolling up to where it says Latest Issues. Tap on the link for any of the most recent emails or hit More Issues to see older ones.

    How many subscribers does The Circadian Classroom have?

    To see how many people subscribe to The Circadian Classroom, simply upgrade your Reletter account. We provide readership numbers and lots of other stats for this newsletter so you can decide if it's worth reaching out to.

    How can I advertise in The Circadian Classroom?

    Newsletter advertising can be extremely effective when it's done right. Before you pitch The Circadian Classroom as a potential sponsor or partner, make sure that you've done your research and checked its newsletter stats with Reletter.

    Then, personalize one of our winning pitching templates and send it to the right person using the contact info provided.

    How much does it cost to sponsor a publication like The Circadian Classroom?

    Newsletter ad rates (or CPM) vary depending on many factors, including industry, number of subscribers, open rate, ad placement and more.

    To find out how much an ad will cost, contact The Circadian Classroom using the contact information provided and ask for a copy of their media kit.

    How can I find newsletters related to The Circadian Classroom?

    Scroll up to where it says Related Newsletters to see other publications like The Circadian Classroom. You can also search our email newsletter directory to discover other newsletters that cover the topics you're interested in.

    How do I contact The Circadian Classroom?

    Reletter provides this newsletter's website URL above, where you will often find their contact information. We also provide links to associated social media accounts and pitching templates so you can reach out fast.