The Meridian journal
Notes on the practice.
Field notes, guides, and the thinking behind Meridian.
Latest · 7 min read
Light Therapy Glasses for Jet Lag: Do They Work, or Is the Sun Enough?
Light therapy glasses for jet lag promise a body-clock reset you can wear. Here's what they really do, why timing beats brightness, and when free daylight wins.
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More from the journal
- 02
Should You Sleep In to Beat Jet Lag? Why the Alarm on Your First Morning Matters More Than the Hours
Should you sleep in to beat jet lag? The extra hours feel like mercy, but the alarm on your first morning in a new time zone quietly sets the clock for the whole trip.
2026-11-10
7 min read
- 03
Jet Lag on a Cloudy Day: Why Overcast Sky Still Beats Your Hotel Lobby for Resetting Your Body Clock
Jet lag on a cloudy day isn't a lost cause. Gray sky is still far brighter than any hotel interior, and it's the signal your body clock needs. Here's how to use it.
2026-11-10
7 min read
- 04
Jet Lag While Pregnant: How to Protect Your Sleep, Your Body Clock and Your Baby's Rhythm When You Cross Time Zones
Jet lag while pregnant isn't just a tired version of normal jet lag. Learn what changes, what to skip, and how to shift your body clock gently before you fly.
2026-11-09
7 min read
- 05
Jet Lag and Sleep Apnea: How to Protect Your CPAP Routine and Your Body Clock Across Time Zones
Jet lag and sleep apnea hit the same nights. Learn why a new time zone can worsen breathing at night, and how to keep your CPAP routine and body clock on track.
2026-11-09
7 min read
- 06
Jet Lag and ADHD: Why a Delayed Body Clock Makes Time Zones Harder, and How to Plan Around It
Jet lag and ADHD collide in a body clock that already runs late. Here's why travel hits harder, and a plan for light, sleep and medication timing that works.
2026-11-09
7 min read
- 07
Window Seat Jet Lag Strategy: How the Shade, the Cabin Lights and Your Eye Mask Steer Your Body Clock at 35,000 Feet
The window shade on your flight is a jet lag tool. Learn how to use the window seat, cabin light and an eye mask to start shifting your body clock before you land.
2026-11-08
7 min read
- 08
Jet Lag Across 2 or 3 Time Zones: Why the Small Shifts Catch You Off Guard
Jet lag across 3 time zones is easy to dismiss and easy to get wrong. Here's why a short hop east can hurt more than you expect, and how to shift your clock early.
2026-11-08
7 min read
- 09
Jet Lag and Low Libido: Why Desire Vanishes on the Trip Meant to Be Romantic
Jet lag and low libido are linked: a confused body clock lowers desire right when you want it most. Here's why the honeymoon-night slump happens and what to do.
2026-11-07
7 min read
- 10
Jet Lag and Bipolar Disorder: Why Crossing Time Zones Can Tip Your Mood, and How to Protect Your Sleep
Jet lag and bipolar disorder: why a lost night of sleep across time zones is a real mood-episode risk, and the steps to take with your care team before you fly.
2026-11-07
7 min read
- 11
Jet Lag and Your Sense of Smell and Taste: Why Food Tastes Flat in a New Time Zone
Why does food taste flat after a long flight? Jet lag and taste are linked: your body clock shapes smell, appetite and thirst. Here's why, and how to get flavor back.
2026-11-06
7 min read
- 12
Jet Lag and Waking to Pee at Night: Why Your Bladder Keeps the Wrong Time in a New Time Zone
Jet lag frequent urination at night isn't random. Your kidneys keep their own clock, and it runs on home time. Learn why you wake to pee abroad and how to quiet it.
2026-11-06
7 min read
- 13
Change Your Watch to Destination Time on the Plane? What the Clock on Your Wrist Can and Can't Do
Should you change your watch to destination time the moment you board? The clock can't reset your body, but it can quietly change every choice you make next. Here's how.
2026-11-06
7 min read
- 14
International Date Line Jet Lag: Why Crossing It Doesn't Cost You a Day, but Choosing Your Direction Can
International date line jet lag confuses the calendar, not your body clock. Learn why a 17-hour shift is really a 7-hour one, and which way to turn your clock.
2026-11-05
7 min read
- 15
Hotel Room Setup for Jet Lag: Darkness, Temperature, and the Small Fixes That Make a New Time Zone's First Night Count
A hotel room for jet lag sleep can help or sabotage your body clock. Learn how dark, cool, and quiet you need it, and the 10-minute setup to do before you unpack.
2026-11-05
7 min read
- 16
Sleep Before a Long Flight: Why the Night Before You Leave Quietly Decides Your Jet Lag
Sleep before a long flight matters more than most travelers think. Learn why the packing-until-2-a.m. ritual makes jet lag harsher, and what to do the week before.
2026-11-04
7 min read
- 17
Hot Shower for Jet Lag Sleep: How Warming Up Helps You Cool Down and Fall Asleep in a New Time Zone
A hot shower for jet lag sleep sounds backwards, but warming your skin helps your core temperature drop. Here's the mechanism, the timing, and what it can't do.
2026-11-04
7 min read
- 18
Why Time Feels Strange After a Long Flight: Jet Lag and Your Sense of Time
Why does time feel warped after a long flight? Jet lag distorts your internal sense of time, not just your sleep. Here is why, and how to stop trusting the wrong clock.
2026-11-03
7 min read
- 19
Jet Lag in Winter: How to Reset Your Body Clock When the Sun Barely Rises
Jet lag in winter is harder when daylight is scarce. Learn why gray, short days stall your body clock, and how to get enough light at the right hour to reset it.
2026-11-03
7 min read
- 20
Jet Lag Grogginess: Why Waking Up in a New Time Zone Feels Like Being Drugged
Waking up in a new time zone can feel like surfacing from anesthesia. Here is the science of sleep inertia and jet lag, plus a first-hour routine that clears the fog fast.
2026-11-03
6 min read
- 21
Jet Lag Anxiety at Night: Why Worrying About Sleep Keeps You Awake in a New Time Zone
Lying awake in a new time zone, dreading tomorrow? Jet lag anxiety at night turns a body-clock problem into a panic problem. Here's the science and how to stop the spiral.
2026-11-03
6 min read
- 22
Tired But Can't Fall Asleep in a New Time Zone? The 'Forbidden Zone' Explained
Exhausted, yet wide awake at your new bedtime? Why you can't fall asleep tired after a flight comes down to a hidden alertness surge, plus what to do about it.
2026-11-02
7 min read
- 23
Jet Lag and Eye Strain: Why Your Eyes Burn and Blur in a New Time Zone
Burning, gritty eyes after a long flight aren't just dry cabin air. Learn how a confused body clock disrupts tears and focus, and how to soothe jet lag eye strain.
2026-11-02
7 min read
- 24
Phone Blue Light and Jet Lag: Does Night Mode Help in a New Time Zone?
Phone blue light and jet lag are tangled together: the screen you scroll in a hotel bed can push your body clock the wrong way. Here's what night mode does and doesn't fix.
2026-11-01
7 min read
- 25
Jet Lag Flying North to South: Why a 12-Hour Flight Can Leave You Fine, or Not
Jet lag flying north to south is usually mild, yet people still land wrecked. Here is what the clock counts, what it ignores, and what actually flattens you.
2026-11-01
7 min read
- 26
Jet Lag and Sleep Trackers: Why Your Wearable Says You Slept Fine When You Feel Wrecked
Your jet lag sleep tracker says 7 hours and a decent score, yet you feel hollow. Here's what wearables can't see in a new time zone, and how to read them anyway.
2026-10-31
7 min read
- 27
Daylight Saving Time Jet Lag: How to Ease Your Body Clock Through the Fall-Back Hour
Daylight saving time jet lag is real: the fall-back hour is a tiny trip west without leaving home. Here's why it still hurts, and how to ease your body clock through it.
2026-10-31
7 min read
- 28
Jet Lag and Decision Making: Why You Shouldn't Trust Big Choices in Your First 48 Hours
Jet lag and decision making don't mix: a jet-lagged brain feels sharp while its judgment slips. Here's why, and what to postpone until your body clock catches up.
2026-10-30
7 min read
- 29
Jet Lag and Couples Fighting on Vacation: Why You Argue the First Day of a Trip, and How to Stop It
Couples fighting on vacation often blame each other when jet lag is the real culprit. Learn why tired body clocks turn small things into fights, and how to protect your first day.
2026-10-30
7 min read
- 30
Jet Lag and Loneliness When Traveling Alone: Why the First Night Feels So Empty, and How to Get Through It
Jet lag and loneliness on a solo trip feed each other. Learn why the first night alone in a new time zone feels so hollow, and the timing fixes that help.
2026-10-29
7 min read
- 31
Jet Lag Headache: Why Your Head Pounds After a Long Flight, and the Caffeine Mistake That Makes It Worse
A jet lag headache is rarely one thing. It is caffeine withdrawal, dry cabin air, and a clock-sensitive brain stacking up. Here is how to take the stack apart before you land.
2026-10-28
7 min read
- 32
Jet Lag Heart Palpitations: Why Your Heart Pounds at 3 a.m. in a New Time Zone
Jet lag heart palpitations feel like an emergency at 3 a.m. in a hotel. Usually it's a daytime heart in a night room. Here's the science, and how to calm it.
2026-10-27
7 min read
- 33
Does a Stopover Help Jet Lag? How Breaking a Long Flight Resets Your Body Clock in Two Steps
Does a stopover help jet lag? Only the right kind. Why a short layover leaves you more tired, and how a two-night stop halfway lets your body clock turn in steps.
2026-10-27
7 min read
- 34
Why Do I Still Feel Jet Lagged After Sleeping? Sleep Debt vs. a Body Clock That Hasn't Moved
Why do I still feel jet lagged after sleeping a full night? Because sleep repays a debt but can't move your body clock. Here's the difference, and what actually works.
2026-10-26
7 min read
- 35
Jet Lag and Vivid Dreams: Why You Dream So Intensely in a New Time Zone
Jet lag vivid dreams aren't random. Your body clock schedules REM sleep, and a new time zone wakes you right in the middle of it. Here's the science, and what to do.
2026-10-26
6 min read
- 36
How to Take Medication Across Time Zones: Keeping Your Doses Safe Through Jet Lag
How to take medication across time zones without missing a dose: why the hours between pills matter more than the clock on the wall, and how to shift safely.
2026-10-26
7 min read
- 37
Jet Lag After Moving Abroad: Why Your First Weeks in a New Country Feel Like a Mistake
Jet lag after moving abroad can pass for regret. Here's why your body clock makes a new life feel wrong at first, and why you should hold off judging the move.
2026-10-25
7 min read
- 38
Chronic Jet Lag in Frequent Flyers: Why You Stopped Feeling It, and Why That Is the Warning Sign
Chronic jet lag doesn't feel like jet lag. Frequent flyers stop noticing it while the brain quietly pays. What the research shows and how to protect your recovery window.
2026-10-25
7 min read
- 39
Jet Lag on Vacation: How to Plan Your First Days So You Don't Waste the Trip You Saved For
Jet lag on vacation can make the first days feel wasted. Plan around your body clock, and see why a groggy start rarely ruins how you'll remember the trip.
2026-10-24
7 min read
- 40
Jet Lag on an Emergency Trip: How to Stay Present for a Family Crisis When There's No Time to Prepare
Jet lag on an emergency trip hits when you need to be at your sharpest. Here's how to plan your alertness around the moments that matter, even with no time to prepare.
2026-10-24
7 min read
- 41
Jet Lag and Long-Distance Relationships: Why the First Day Together Goes Wrong
Jet lag in a long-distance relationship can turn a long-awaited reunion into a fight. Here's why a tired body clock misreads the person you love, and how to stop it.
2026-10-23
6 min read
- 42
Is It Safe to Drive After a Long-Haul Flight? Jet Lag, Microsleeps, and the Road Home From the Airport
Driving after a long-haul flight can impair you like a drink you never had. Here's why jet lag makes the airport drive so risky, and what to do before you take the keys.
2026-10-23
7 min read
- 43
How to Beat Jet Lag Before a Marathon or Race: Why Your Body Runs on the Clock You Left Behind
Jet lag before a marathon can quietly undo months of training. Learn why your start time matters to your body clock, and how to arrive with your legs truly awake.
2026-10-23
7 min read
- 44
Why You Get Sick After Flying: How Jet Lag Lowers Your Immune Defenses
Why do I get sick after flying? It's rarely the recycled cabin air. Jet lag desynchronizes your immune system's internal clock — here's how to protect it.
2026-10-22
6 min read
- 45
Can Jet Lag Delay Your Period? How a Confused Body Clock Pushes Back Ovulation
Can jet lag delay your period? Often, yes. Your body clock helps time ovulation, so a long flight can push it back. Here's why your cycle notices, and what to do.
2026-10-22
7 min read
- 46
Why Jet Lag Makes You Crave Junk Food: The Hunger Hormones a Confused Body Clock Sets Loose
Why jet lag makes you crave junk food isn't weakness — it's leptin and ghrelin thrown off by a confused body clock. Here's the science and how to eat your way back to normal.
2026-07-12
7 min read
- 47
How Much Melatonin for Jet Lag: Why a Smaller Dose Resets Your Body Clock Better
How much melatonin for jet lag actually works? The surprising answer: a tiny dose beats a big one. Here's the dose-response science that stops the grogginess.
2026-07-12
7 min read
- 48
Social Jet Lag: Why You Feel Jet-Lagged Every Monday Without Ever Boarding a Plane
Social jet lag is the Monday-morning grogginess of living in two time zones at once. Learn how weekend sleep shifts lag your body clock — and how to fix it.
2026-07-11
7 min read
- 49
How to Sync a New Team Across Time Zones When You Land: Beating Jet Lag Before a Big Meeting
Landing sharp for a business trip isn't luck. Here's how to time your body clock so peak alertness lands on your meeting, not your hotel pillow — jet lag business travel, solved.
2026-07-11
7 min read
- 50
How Pilots Deal With Jet Lag: The Anchor Sleep Strategy Aircrew Use Every Week
How do pilots deal with jet lag? Mostly, they refuse to adjust. Inside anchor sleep and controlled rest — the aircrew strategies you can borrow for any trip.
2026-07-11
7 min read
- 51
Why You Sleep Badly the First Night in a Hotel — The First-Night Effect, Explained
The first-night effect explains why you sleep badly in hotels even without jet lag: half your brain stays on watch. Here's how to switch the sentry off.
2026-07-10
7 min read
- 52
Do Sleeping Pills Help Jet Lag? What Sedatives Really Do to Your Body Clock
Do sleeping pills help jet lag? They can buy you a night of sleep — and quietly hide the fact that your body clock hasn't moved an inch.
2026-07-10
7 min read
- 53
Jet Lag Brain Fog: Why Your Thinking Goes Fuzzy Before You Feel Tired
Jet lag brain fog arrives before the sleepiness does — and you won't notice it happening. Here's the circadian science behind the fuzziness, and how to time your best thinking abroad.
2026-07-09
7 min read
- 54
How to Beat Jet Lag With Kids: Resetting a Child's Body Clock Without Wrecking the Trip
How to beat jet lag with kids using light, meals, and routine — the science of resetting a child's body clock faster, plus what actually works at 3 a.m.
2026-07-09
7 min read
- 55
Why Jet Lag Wrecks Your Mood: The Emotional Side of a Confused Body Clock
Jet lag and mood are tightly linked: crossing time zones makes you irritable, tearful, and anxious for real neurological reasons. Here's why—and how to steady yourself faster.
2026-07-08
6 min read
- 56
Best Time to Fly to Avoid Jet Lag: How Your Arrival Time Quietly Decides the Damage
The best time to fly to avoid jet lag isn't about comfort — your arrival time decides whether the first daylight you meet resets your body clock or wrecks it. Here's how to book smarter.
2026-07-08
7 min read
- 57
Fasting to Beat Jet Lag: How Skipping Meals on the Plane Can Reset Your Body Clock
Fasting to beat jet lag works through your gut's own clock, not just your brain's. Here's the real science of when to stop eating before a long flight.
2026-07-07
6 min read
- 58
Does Jet Lag Get Worse With Age? The Science of an Aging Body Clock
Does jet lag get worse with age? The science says yes, and here's why — a flatter circadian rhythm, less melatonin, and a clock that resists reset.
2026-07-07
7 min read
- 59
Why Is Jet Lag Worse Coming Home? The Return Trip Your Body Didn't Plan For
Jet lag coming home often hits harder than the trip out. Here's the circadian and sleep-pressure science behind reverse jet lag—and how to plan the return leg.
2026-07-06
7 min read
- 60
How to Beat Jet Lag Crossing 8+ Time Zones: Which Way Your Body Clock Should Turn
Beating jet lag crossing multiple time zones hinges on one hidden choice: which way your body clock turns. Steer it right and you can halve your recovery.
2026-07-06
6 min read
- 61
Travel Fatigue vs Jet Lag: Why You're Exhausted Even When the Clocks Don't Change
Travel fatigue vs jet lag: why you feel wrecked flying north to south with no time change, what causes each, and how to recover from the tiredness that isn't your body clock.
2026-07-04
6 min read
- 62
Jet Lag Stomach Problems: Why Your Gut Gets Confused Before Your Head Does
Jet lag stomach problems—bloating, constipation, and odd hunger at 3 a.m.—come from a second body clock in your gut. Here's how meal timing quietly resets it.
2026-07-04
7 min read
- 63
Your Body Temperature Minimum: The Hidden Clock That Decides Whether Light Fixes or Worsens Jet Lag
Your body temperature minimum is the fulcrum of jet lag recovery — get light before it and your clock drifts later, get light after it and it shifts earlier. Here's how to find yours.
2026-07-03
7 min read
- 64
Why Is Jet Lag Worse on the Second Day? The Science of Internal Desynchronization
Why is jet lag worse on the second day than the first? The answer is internal desynchronization — your body's clocks drifting apart. Here's what's happening and how to steady them.
2026-07-03
7 min read
- 65
How to Use Sunglasses to Beat Jet Lag: The Art of Blocking Light at the Right Time
Learn how to use sunglasses for jet lag by blocking light at the wrong circadian hour. Strategic darkness resets your body clock as powerfully as morning sun.
2026-07-03
7 min read
- 66
Does Alcohol Make Jet Lag Worse? What a Drink on the Plane Does to Your Body Clock
Does alcohol make jet lag worse? The wine that helps you doze off on a long-haul flight quietly wrecks the sleep and melatonin your body clock needs to reset.
2026-07-02
7 min read
- 67
Jet Lag Insomnia: Why You Wake at 3 a.m. in a New Time Zone
Jet lag insomnia isn't random — it's two body systems out of sync. Here's why you wake at 3 a.m. abroad and how to time light and sleep to fix it.
2026-06-27
7 min read
- 68
Does Dehydration Cause Jet Lag? What Water Really Does on a Long Flight
Does dehydration cause jet lag? Dry cabin air leaves you parched, but the grogginess after landing is a clock problem, not a thirst one. Here's the real difference.
2026-06-27
6 min read
- 69
How to Beat Jet Lag on a Short Trip: Why Staying on Home Time Often Wins
Learn how to beat jet lag on a short trip by anchoring to home time instead of fighting your body clock. The science of when not to adjust — and what to do instead.
2026-06-26
7 min read
- 70
Are Night Owls Better at Jet Lag? How Your Chronotype Changes the Recovery
Are night owls better at jet lag than morning larks? Your chronotype quietly decides which direction wrecks you — and how to plan light and sleep around it.
2026-06-26
7 min read
- 71
Exercise and Jet Lag: How to Time Workouts to Reset Your Body Clock
Exercise is a real circadian cue, but the clock-shifting power is in the timing. Here's how to use workouts for jet lag — when to move, and when to stay still.
2026-06-24
7 min read
- 72
How to Sleep on a Long-Haul Flight to Beat Jet Lag — Before You Even Land
How to sleep on a long-haul flight to beat jet lag: the science of timing in-flight sleep to your destination's clock, so you land already on the right schedule.
2026-06-23
7 min read
- 73
How to Nap to Beat Jet Lag Without Wrecking Your First Night
How to nap to beat jet lag: the science of timing a short recovery nap so you survive the day after landing without sabotaging sleep that night.
2026-06-23
7 min read
- 74
How to Use Caffeine for Jet Lag: Strategic Coffee Timing That Resets Your Body Clock
Learn how to use caffeine for jet lag the right way. The timing of your coffee—not the amount—decides whether it speeds your adjustment or wrecks your sleep.
2026-06-22
7 min read
- 75
How to Adjust to a New Time Zone Before You Travel: Pre-Shifting Your Body Clock
Learn how to adjust to a new time zone before traveling by pre-shifting your body clock a few days early. The science of phase response, and why small daily shifts beat one big leap.
2026-06-22
7 min read
- 76
How Long Does Jet Lag Last? The One-Day-Per-Time-Zone Rule, Explained
How long does jet lag last, really? A clear look at why recovery takes roughly a day per time zone, what's happening inside your body clock, and how to speed it up.
2026-06-22
7 min read
- 77
When to Take Melatonin for Jet Lag: Timing It to Your Destination's Clock
Knowing when to take melatonin for jet lag matters more than the dose. Here's how to time it to your destination so your body clock actually shifts.
2026-06-21
7 min read
- 78
How to Use Light to Beat Jet Lag: Timing Is Everything
Learn how to use light to beat jet lag by timing bright light and darkness around your body clock's pivot point — the simple rule that decides whether light helps or hurts.
2026-06-19
7 min read
- 79
Why Jet Lag Is Worse Flying East — and How to Outsmart Your Body Clock
Why is jet lag worse flying east? Your body clock runs slightly long, so it would rather delay than advance. Here's the circadian science — and how to use light to win.
2026-06-16
7 min read
- 80
Meal Timing for Jet Lag: How When You Eat Resets Your Body Clock
Meal timing for jet lag is the quiet lever most travelers ignore. Learn how strategic eating and a short fast help your body clock land before you do.
2026-06-16
7 min read