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Circadian Health

11 articles

An elegant bedroom with dark walls and an upholstered bed
Circadian Health

Your Sleep Environment: How Temperature, Light and Noise Shape the Night

Before supplements and gadgets, fix the room. Temperature, light and noise are the three physical levers with real physiology behind them — and most bedrooms fail at least one. Here is what the evidence says, and how to fix each for a few euros.

9 min read
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A plated dish being served at a candle-lit restaurant table in the evening
Circadian Health

Meal Timing: Eating in Sync With Your Body Clock

Your metabolism is not the same machine at 8 am and 10 pm. Chrononutrition research — a real-world weight-loss cohort, a big-breakfast trial, and a mechanism study — shows the same calories land differently by clock time. Here is what to do about it, without dogma.

9 min read
A lone runner on a wet road at dusk
Circadian Health

Morning or Evening Workouts? What Exercise Timing Really Changes

The best time to work out is the time you’ll actually stick to — but timing still changes real things. Strength peaks in the late afternoon, workouts shift your body clock the way light does, and evening exercise doesn’t ruin sleep the way the old advice claimed. Here’s what the evidence says, and how to find your own window.

9 min read
A tabby cat lounging on a couch among cushions
Circadian Health

The Science of Napping: How to Recharge Without Ruining Your Night

A ten-minute nap can sharpen you for hours; a sixty-minute one can leave you groggier than before and steal from your night. Here’s what sleep labs found about nap dose and timing — plus a simple protocol, coffee nap included.

9 min read
A purple starry night sky over a silhouetted horizon
Circadian Health

Chronotypes: Why Your Body Clock Runs Early or Late — and How to Work With It

Whether your body clock runs early or late is a biological trait, not a discipline problem. Here is what the research says about larks, owls and everyone in between — and how to time sleep, work and training to match your clock instead of fighting it.

9 min read
An hourglass standing on dark pebbles
Circadian Health

Sleep Debt: What It Really Costs and Whether You Can Pay It Back

Two weeks of six-hour nights can impair you as much as a night without sleep — while you rate yourself only mildly tired. What sleep debt really costs, what the weekend lie-in can and can’t repay, and how to settle the balance for real.

9 min read
Three coffee cups with latte art held together in a toast, seen from above
Circadian Health

Caffeine and Sleep: Why Timing Matters More Than Quantity

Caffeine doesn't create energy - it hides your brain's sleepiness signal, and it lingers far longer than the buzz. Controlled trials show even a coffee six hours before bed measurably cuts sleep while you barely notice. Here's how to find your personal cut-off without giving up coffee.

9 min read
A golden sunrise over rolling hills with wildflowers in the foreground
Circadian Health

Morning Light: The Free Circadian Signal That Sets Up Your Sleep

Your sleep tonight is negotiated in the first hour of your morning. Light is the master signal that sets your circadian clock, and the outdoor dose dwarfs anything your ceiling can deliver - here is the science, and a ten-minute protocol you can start tomorrow.

9 min read
A hand holding a small white retro alarm clock
Circadian Health

Sleep Consistency: Why a Regular Bedtime Beats Extra Hours

In a large accelerometer study, how regularly people slept predicted mortality risk more strongly than how long they slept. Here is why a steady schedule beats extra weekend hours, what social jetlag does to your metabolism, and how to anchor your rhythm in practice.

9 min read
A simple plate of egg on toast with tomato on a dark background
Circadian Health

Intermittent Fasting: What the Science Really Says About When You Eat

Intermittent fasting collected both genuine science and plenty of hype. Here's what the evidence actually shows about time-restricted eating and metabolic health, who should be cautious, and how to test whether it works for you.

9 min read
Person sleeping peacefully in a dark bedroom with soft morning light filtering through curtains
Circadian Health

The Science of Sleep: How Better Nights Extend Your Healthspan and Longevity

Sleep clears neurotoxic waste, regulates appetite hormones, resets the immune system, and protects your heart. Here's what two decades of research reveals — and how tracking sleep alongside other health metrics unlocks the patterns that matter.

16 min read