Circadian biology

The Molecular Biology of Clock Genes: BMAL1 and PER2

How do your cells know what time it is? Discover the genetic clockwork of BMAL1 and PER2, the oscillating proteins that dictate your entire metabolism every 24 hours.

The Biology of Circadian Rhythms: Sleep, Metabolism, and the SCN

Why does shift work cause diabetes? Discover the Suprachiasmatic Nucleus (SCN)—the master clock in your brain that synchronizes every organ in your body.

The Science of Circadian Misalignment: Social Jetlag

Why sleeping in on weekends makes you sick. Discover the biology of 'Social Jetlag' and how shifting your wake time by just two hours disrupts your entire endocrine system.

The Molecular Biology of Melanopsin: The Brain's Light Meter

Go beyond rods and cones. Discover Melanopsin—the non-visual light sensor in your eye that sets your circadian clock and controls your pupil reflex.

The Biology of Blue Light and Skin Clocks: Digital Aging

Your skin is watching your phone. Discover how High-Energy Visible (HEV) blue light disrupts your skin's internal repair clocks, leading to 'Digital' aging.

The Science of Photoperiodism: The Melatonin Legacy

Why your light history matters. Discover the 'Melatonin Legacy'—how the light you saw yesterday dictates your sleep quality tonight.

The Biology of Phototaxis in Humans: Light Direction and Mood

Why the angle of light matters. Discover the biology of Phototaxis and how the direction of light affects your posture, mood, and circadian clock.

Science of Cutaneous Phototransduction: Why Your Skin 'Sees' Light

Your eyes are not your only light sensors. Discover the Opsin receptors in your skin and how they regulate systemic circadian rhythms and melanin production.

The Neurobiology of the 'Internal Clock': The Role of FMO3 and Metabolic Timing

Why your 'Internal Clock' is not just in your brain. Discover how the FMO3 gene in the liver regulates the timing of your [metabolism](/articles/topics/metabolism) and your risk for heart disease.

The Science of 'Photoperiodism': How Day Length Changes Your Brain

Beyond Vitamin D, explore the biological impact of changing day length on your neurotransmitters, metabolism, and the 'Seasonal' brain.

The Science of Chrono-Nutrition: Why 'When' You Eat Matters

Explore the intersection of circadian biology and metabolism, and how the timing of your meals influences insulin sensitivity, gene expression, and your gut microbiome.

The Glymphatic System: The Brain's Nocturnal Waste-Clearance Mechanism

Discover the specialized metabolic waste clearance system of the central nervous system, and why deep, non-REM sleep is biologically non-negotiable for preventing neurodegenerative diseases.