The department of
Circadian
Circadian rhythm is your body's 24-hour internal clock, shaping sleep timing, alertness, and hormones — essays, science, and field notes on living with it.
Pieces
6
Circadian
July 2026 · 5 min
Diagnosing Shift Work Disorder: What a Sleep Study Can and Can't Tell You
You have been sleeping badly since you switched to nights. A friend, trying to help, says the words everyone says: you should get a sleep study.
By Judith Hawthorn · Read →
Circadian
July 2026 · 4 min
Why Does Daylight Saving Time Wreck You for a Week? The Honest Answer
Every March, some version of this question arrives around Tuesday: why does losing a single hour feel like jet lag without the trip? You went to bed at the usual time, more or less.
By Laura Pendleton · Read →
Circadian
July 2026 · 10 min
Postprandial Somnolence: Why Lunch Makes You Sleepy, in the Order It Actually Happens
You finish lunch, sit back down at your desk, and within forty minutes the screen starts to blur. You've probably been told why: blood rushes from your brain to your gut to handle the meal, and your…
By Owen Blackwell · Read →
Circadian
July 2026 · 10 min
Can You Actually Adapt to Shift Work? I Spent Three Rotations Trying to Find Out
Here is the question I actually wanted answered, the one I could never get a straight reply to from a manager or a forum: does your body ever adapt to shift work, or do you spend the whole time just…
By Rachel Stanton · Read →
Circadian
June 2026 · 5 min
Sleep Deprivation in Teenagers Isn't a Discipline Problem. It's a Clock Problem.
Your tired teenager is probably not lazy, and probably not staying up out of defiance. The most likely explanation is duller and more biological than either: their internal clock has shifted later…
By Daniel Whitfield · Read →
Circadian
June 2026 · 4 min
The 40-Minute Debt: What Sleep Deprivation Actually Does to Your Metabolism
Here is a number that has done more rhetorical work than it can support: about 40 minutes. That's roughly the amount of weekday sleep debt — the gap between what people got on workdays and what they…
By Sophie Alderton · Read →
— Adjacent departments
You might also be wandering toward
Ad109 1
Adenosine 2
Adherence 6
Adjustable Beds 1
Aging 1
AHI 3
Ai 3
Ai Tools 1
Air Travel 1
Airbed 1
Airpods 2
Airway 4
Alcohol 3
Allergens 2
Allergies 3
Altitude 1
Anatomy 1
Anxiety 3
APAP 1
Apnea 13
Appearance 1
Apple 2
Apple Events 1
Apple Watch 4
Ar Adoption 1
Aromatherapy 1
Athletes 2
Attention 1
Audio 1
Augmentation 2
Augmented Reality 1
Australia 3
Autonomic 1
Awards 1
Back Pain 2
Batteries 1
Battery 1
Battery Life 1
Bed Frames 1
Bedding 9
Bedtime Routine 1
Bedtime Routines 1
Behavior 1
Behavioral 1
Biohacking 1
Biology 1
Biotech 1
Blood Pressure 3
Blue Light 2
Body Composition 1
Bradycardia 1
Breastfeeding 2
Breathing 6
Bruxism 1
Burnout 1
Buying Guide 3
Caffeine 145
Caffeine Timing 3
Calorie Tracking 1
Camping 3
Canada 1
Cannabis 1
Cardiac Health 1
Cardiac Risk 1
Cardiology 1
Cardiovascular 6
Caregiving 2
Casio 2
Cbt 1
CBT-I 10
Central Sleep Apnea 1
Cgm 1
Cheyne Stokes 1
Child Safety 1
Children 2
China Market 1
Chronic Fatigue 1
Chronic Pain 1
Chronobiology 2
Chronotype 2
Circadian Biology 1
Circadian Rhythm 3
Cleaning 1
Clinical 1
Coffee 1
Cognition 1
Cognitive Health 1
Cold Sleep 1
Colorado 1
Comfort 1
Comforters 1
Community 1
Commuting 1
Comorbidities 3
Comorbidity 1
Compliance 1
Congestion 2
Consolidation 1
Consumer Tech 1
Cooling 2
Copd 5
Cortisol 1
Couples Sleep 1
CPAP 159
CPAP Alternatives 4
CPAP Travel 1
Cross Cultural 1
CSA 3
Cycle Tracking 1
Daylight 1
Daylight Saving 1
Daylight Saving 2
Deals 2
Decaf 1
Deep Sleep 2
Delivery 1
Dental 1
Dental Sleep 1
Dentistry 1
Depression 4
Design 2
Device Design 1
Device Registration 1
Devices 9
Diabetes 3
Diagnosis 55
Diagnostics 3
Diet 3
Displays 1
Dogs 1
Dopamine 1
Dopamine Agonists 1
Dorm 2
Down Jackets 1
Dream Diary 1
Dreams 1
Drowsy Driving 2
Dust Mites 2
Earbuds 1
Earnings 1
EEG 1
Emotion 1
Engineering 2
Enterprise Tech 1
Equipment 2
Evidence 3
Exercise 3
Experiment 7
Experiments 4
Eye Health 1
Fatigue 4
Fear 1
Fintech 1
Fitbit 1
Fitness+ 1
Fleece 1
Foam 1
Foldables 1
Framework 1
Gadgets 3
Garmin 11
Gear 19
Gear Review 1
Gear Deals 1
Genetics 1
Gerd 1
Gerontology 1
Glp 1 7
Glucose 1
Gps 1
Gps Watches 1
Guelph 1
Guidelines 1
Habits 2
Headaches 2
Headphones 4
Health 3
Health Equity 1
Health Myths 1
Health Risks 1
Health Tech 1
Healthtech 1
Heart 1
Heart Failure 1
Heart Health 2
Heart Rate 1
Holidays 1
Home Testing 3
Homecare 1
Hot Sleepers 2
Hrv 1
Humidification 5
Humidifier 1
Hybrid 1
Hygiene 2
Hyperarousal 1
Hypertension 4
Hypopnea 1
Hypoxia 1
Idiopathic Hypersomnia 1
Immunology 1
Implants 1
India 1
Infant Sleep 2
Insomnia 29
Insurance 2
Investing 1
Japan 2
Jet Lag 1
Ketones 1
Laundry 2
Law Enforcement 1
Layering 1
Lifestyle 3
Light 6
Light Exposure 2
Linens 1
Litigation 1
Livestream 1
Loneliness 1
Long Covid 1
Longevity 1
Lung Health 1
Magnesium 2
Maintenance 1
Market Analysis 3
Market Research 1
Market Sizing 1
Market Sizing 1
Markets 1
Mask Comfort 1
Mask Fit 2
Mask Fitting 2
Masks 3
Maternal Health 2
Mattress 2
Mattress Review 2
Mattresses 13
Me/cfs 2
Measurement 1
Mechanisms 1
Media 1
Medical Cost 1
Medical Devices 6
Medicare 1
Medication 3
Medications 1
Medtech 10
Melatonin 6
Memory Foam 1
Menopause 2
Mental Health 5
Metabolism 5
Michigan 1
Microbiome 2
Mindfulness 2
Mixed Reality 1
Monitoring 1
Mood 1
Morning Light 1
Myair 2
Myths 2
Napping 2
Narcolepsy 3
Nasal Aids 1
Nasal Breathing 1
Nasal Dilators 1
Natural Remedies 1
Neck Pain 2
Neonatal 1
Nerve Stimulation 1
Neurology 1
Neuroscience 2
Neurotech 1
Neuroticism 1
New Parents 1
Nicu 1
Night Eating 1
Night Owls 1
Nightmares 1
Noise 4
Non Pharmacological 1
Notifications 1
NREM Sleep 1
Nutrition 3
Obesity 1
Obesity Treatment 1
Occupational Health 1
Ohrqol 1
Oral Appliance 1
Oral Appliances 4
Oral Care 1
Orientation 1
OSA 5
Oura Ring 1
Outdoor Gear 1
Overlap Syndrome 1
Pacing 1
Pain 1
Pap Therapy 1
Parasomnias 2
Patient Care 1
Patient Education 2
Pediatric 1
Pediatric Sleep 1
Pediatrics 1
Pem 1
Personality 1
Pets 2
Physiology 1
Pillow Speakers 1
Pillows 6
Pixel 1
Policy 4
Polyphasic 1
Polysomnography 4
Position 1
Positional Therapy 2
Pregabalin 1
Pregnancy 4
Pressure Relief 1
Prevention 1
Pricing 1
Privacy 2
Product Review 1
Product Testing 1
Psychology 1
Ptsd 2
Quest 3 1
Race Safety 1
Rail 1
Recalls 5
Reflux 1
Regulation 2
Regulatory 2
Relationships 2
Relaxation 1
REM Sleep 1
Research 3
Resmed 6
Resolutions 1
Respiration 1
Respiratory 4
Respiratory Health 1
Restless Legs 1
Review 4
Reviews 12
Risk Factors 2
RLS 5
Running 9
Running Tech 1
Sad 1
Samsung 1
Scent 1
Screening 1
Screens 1
Sedentary 1
Segmented Sleep 1
Self Experiment 8
Self Testing 1
Self Tracking 2
Sex Differences 1
Sexsomnia 1
Shift Work 5
Shopping 1
Side Sleepers 2
Skin 1
Skincare 1
Sleep 127
Sleep Apnea 7
Sleep Market 1
Sleep Tech 2
Sleep Tracking 5
Sleep Aids 4
Sleep Anxiety 1
Sleep Apnea 269
Sleep Apps 1
Sleep Data 1
Sleep Debt 2
Sleep Deprivation 3
Sleep Diagnosis 1
Sleep Disorders 8
Sleep Duration 1
Sleep Environment 1
Sleep Gear 5
Sleep Genetics 1
Sleep Health 18
Sleep History 1
Sleep Hygiene 7
Sleep Inertia 2
Sleep Medicine 3
Sleep Myths 2
Sleep Nutrition 1
Sleep Onset 1
Sleep Position 1
Sleep Posture 1
Sleep Products 2
Sleep Quality 1
Sleep Research 1
Sleep Schedule 1
Sleep Science 10
Sleep Stages 1
Sleep Study 3
Sleep Tech 15
Sleep Testing 5
Sleep Therapy 2
Sleep Timing 1
Sleep Trackers 1
Sleep Tracking 49
Sleepapnea 1
Sleepwalking 1
Smart Beds 1
Smart Mattresses 1
Smart Rings 1
Smartwatch 1
Smartwatches 7
Snoring 7
Sponsorship 1
Spotify 1
Stress 3
Stroke 2
Sunrise Alarms 1
Supplements 3
Surgery 4
Symptoms 2
Tailgating 1
Tbi 1
Teenagers 1
Temperature 1
Terminology 1
Testing 11
Therapy 2
Thermoregulation 1
Tinnitus 1
Trackers 2
Tracking 2
Training 1
Training Metrics 1
Travel 19
Treatment 14
Treatments 1
Troubleshooting 1
UARS 1
Unpacked 1
Va Claims 1
Vaccination 1
Ventilation 1
Ventilators 1
Veterans 2
Virtual Reality 1
Vpap 1
Vr 2
Vr Accessories 1
Watch Faces 1
Water 1
Waterproofs 2
Wearables 108
Weight 1
Weight Loss 4
Wellness 1
Wellness Tech 1
Whistleblowing 1
White Noise 1
Winter 2
Winter Camping 1
Wnba 1
Women's Health 2
Womens Health 3
Xr 2
Xyrem 1
Yoga 1