The 80/20 Circadian Course

Trusted by 200+ students

Your body runs on light and timing. You’re getting both wrong.

Most health problems people spend years managing come down to a handful of timing inputs. This course shows you what they are and how to fix them.

Complete implementation framework5 practical modulesHosted on NotionWorks on any device

Start my reset · $199

One-time purchase · Lifetime access · Start in 5 minutes

What you getA clear order of operations for light, sleep, and meal timing.

Built for real lifeWorks for parents, travelers, shift workers, and messy schedules.

Fast to startOpen it today. Know what to do first. Start within minutes.

Made to simplifyNo gadgets. No supplements. No overhaul.

You've tried everything.
That's the problem.

You track your sleep. You take supplements. You follow protocols. And you still wake up tired and crash at 2pm.

The problem isn't effort. It's order of operations.

You don't need more information. You need the right inputs.
Your body isn't broken. It's responding to broken signals.
The fix is simpler than everything you've tried.

Most of what people try to fix is downstream. A few upstream inputs control the rest.

This course helps you find those inputs and fix them in the right order.

What you get

Step-by-step roadmapWhat to fix first, second, and third.
Five focused modulesLight, sleep, metabolism, meal timing, and real-life adaptation.
Lifetime accessBuy once. Get every future update.
Real-world troubleshootingWhat to do when life gets in the way.

What people notice first

You stop fighting sleep

Most people notice they fall asleep faster within the first few days. Not because of a supplement. Because they fixed a timing input.

The afternoon crash gets smaller

When your cortisol timing is less wrong, the 2pm crash stops hitting so hard. Most people feel this in the first week.

Fat loss stops being a fight

Same food, different timing. People report that weight starts moving once they fix when they eat relative to light exposure.

Thinking gets clearer

Brain fog is often a timing problem. When the inputs improve, people say the sharpness comes back on its own.

People who fixed their rhythm

"I wish I would have had this 2 years ago."

My health is already improving applying the knowledge. Big early change is visual acuity. If I ever practice my integrative sports medicine again it will be a circadian centered practice.

— @SirPalmeroy

"My afternoon slump vanished and sleep got fixed."

One of the best courses to fix your circadian rhythm. Now I understand why he didn't give a big list of supplements in the course.

— @BhavanChand

"This is a life-long learning opportunity. GO FOR IT."

The course will be regularly updated with distilled insights that would take many of us years to research, study, understand and apply.

— @TheMenta1ist

Be honest with yourself

This isn't for you if

You want a magic supplement list
You're looking for another hack to collect
You won't change how you interact with light
You want complex, not clear

This is for you if

You're tired of trying everything and still feeling off
You want a framework, not another rabbit hole
You want to fix root causes, not manage symptoms
You're ready to do less, but do it right

What's inside your course

How the circadian system actually works

The foundation that makes all other health advice click or fall away.

The 80/20 light rules

The single biggest lever. Which light exposures matter, which don't, and how to use sunrise, midday, sunset, and darkness strategically. Without living like a monk.

Sleep. Fixed without forcing it

Your sleep problem is a daytime problem. Fix the day, fix the night.

Metabolism & fat loss, circadian-first

Why calories fail when timing is wrong. How to make fat loss feel easy.

Built for real life

How to recover from late nights and stop obsessing over perfection.

Common questions

What happens after I buy?

You get a link to your Notion workspace within 60 seconds of checkout. Open it, start reading, start applying. No waiting, no drip schedule, no hoops.

Do I need any special equipment?

No. Just sunlight, darkness, meal timing, and your environment.

How long do I have access?

Lifetime. One payment, every future update included.

I already know about circadian biology. Is this still useful?

Most people who say this have scattered knowledge but no clear framework. This gives you the order of operations so you stop researching and start doing.

What format is the course?

It's a structured implementation framework hosted on Notion. You can work through it at your own pace on any device.

What if I have a complicated schedule or can't get morning sunlight?

Module 5 is built specifically for this. The course gives you real-life adaptation strategies for shift workers, parents, travelers, and anyone who doesn't live in a perfect world.

This will either be behind you or still on your plate.

Same routine. Same symptoms. Same confusion about what to try next.

Or you learn which inputs actually matter, fix them, and move on with your life.

One-time purchase.
Less than a month of supplements.

You’re not paying for more information. You’re paying for a simpler system and fewer wasted months.

Monthly supplement stack$80–200/mo

Functional medicine consult$300–500

Sleep coach (6 sessions)$600–1,200

Biohacking gadgets you stopped using$200–1,000

The 80/20 Circadian Course$199 once

The longer you wait, the more months you spend managing symptoms instead of fixing inputs.Most people say they wish they had started sooner. The course is here when you are.

One investment. Lifetime access.

$199

One-time · Lifetime access · No subscription

Complete roadmap you can start today
Light, sleep, metabolism, and fat loss in the right order
Real-life playbooks for imperfect schedules
All future updates included

Start my reset

Secure checkout · Instant delivery · Start today

One purchase. A simpler system.

You do not need another pile of hacks. You need a clear circadian framework you can actually follow, revisit, and use for years.

Start my reset · $199

One-time purchase · Lifetime access · Start in 5 minutes

Meet Zaid

I run a circadian biology newsletter read by over 10,800 people on Substack, where I translate peer-reviewed research into first principles that actually change how people live. I've coached clients one-on-one and watched the same pattern repeat: people drowning in health information while missing the handful of inputs that actually matter.

I built this course to fix that. Not more content. Not another protocol. Just the right inputs, in the right order, explained once so you can stop researching and start living.

I built this because I kept watching people apply massive effort for minimal return. Or quit entirely because the information load was crushing them. I've also experienced and witnessed how life-changing this work can be.

The problem is never motivation. It's knowing which levers actually matter.

If you take this seriously, it will permanently change how you think about health. And how little effort it actually requires.

Much love, Zaid

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