Jet Lag Planner

Jet Lag Remedies That Don't Work (and What Actually Works for You)

Someone will always tell you how they beat jet lag. Fast for a day before you fly. Walk barefoot on the grass the moment you land. Have a glass of red on the plane so you drop off. You've probably been handed every one of these tips, usually with great confidence, and most of them do nothing measurable to jet lag. The slightly deflating truth is that almost none of the famous cures, the feast-and-fast diets, the sleeping pills, the homeopathic tablets, the barefoot grounding, actually moves your body clock. Each one either has no real evidence behind it or simply makes the flight more pleasant while your clock stays exactly where it started. Two things genuinely move the clock: daylight caught at the right hour, which does most of the lifting, and correctly timed melatonin, which has real trial evidence but a different legal status in every country and a nasty habit of backfiring when mistimed. Everything else that helps, caffeine and sleep timing chief among them, works by keeping you on the new schedule while light does the moving. What follows is the honest sort, the stuff that works, the stuff that doesn't, and the comfort tricks worth doing anyway even though they never lay a finger on the clock.

The one question that sorts myth from method

Almost all of this untangles if you put one blunt question to any jet lag tip: does it actually move your body clock, or does it only make you feel better while you wait for the clock to catch up on its own? Both jobs are worth doing on a long trip, and nobody should talk you out of a more comfortable flight. The trouble is that the two get blurred together, and that blur is where the myths breed. A remedy that makes you feel more human gets upgraded to a cure that resets your clock, which it never did in the first place. Hold the two apart in your head and most of the confusion falls away.

The famous cures that leave your clock untouched

Start with the one that refuses to die, the feast-and-fast diet. The old Argonne-style plan has you alternating big feast days and near-fasting days in the run-up to a flight, and it still gets repeated in travel columns on almost no evidence. Food is a genuine but weak signal to the human clock, far weaker than light, so shifting your meal times toward your destination helps a new routine bed in and does no harm at all (there's a fuller look at that in Meal Timing and Jet Lag: What the Evidence Really Says). The strict starve-yourself version, though, asks a great deal and delivers very little, so move your mealtimes and skip the fasting theatrics.

Then there are the pills, which really fall into two very different piles. Sleeping pills might knock you out for a few hours over the Atlantic, and whether to use them is a proper conversation for you and your doctor rather than a travel article. What they do not do is move your circadian clock, and they can leave you thick-headed the next day, so a decent flight's sleep is all you're buying, never a reset. The homeopathic "no jet lag" tablets sold near the pharmacy till are easier to judge: there is no independent controlled evidence that they shift the body clock, the only supporting trial anyone points to is the one the manufacturer commissioned, and any relief you notice is your own expectation doing the work. Save the shelf space.

Gritting your teeth and powering through deserves a mention, because so many people treat it as the tough, no-nonsense option. It isn't really a method. You'll still drift at about an hour a day going east and an hour and a half going west whatever you do, and with no plan for when to chase light and when to dodge it, you can easily end up parked in bright morning sun at the exact wrong hour and nudge your clock backwards. Grounding, the walking-barefoot-on-arrival ritual, lands in the same place for a nicer reason: it's pleasant and it gets you outdoors, but there's no credible evidence it touches your circadian timing. If it seems to help, thank the daylight you soaked up while standing there, not the grass under your feet.

Blue-light glasses belong in this pile too, at least for jet lag. Blocking blue light in the evening is a real mechanism, and blue-blockers are a legitimate way to dodge light in an avoid window, so they're a tool rather than a fraud. What they aren't is an upgrade: the research on the other side of it found bright blue-light boxes were no more effective than plain bright white ones, so the colour is doing less work than the marketing suggests. Timing is the thing that matters, and a pair of very dark sunglasses does the dodging job just as well.

Hydration is the one that most deserves defending, because it does matter, just not for the reason people claim. Cabin air sits somewhere around 10 to 20% humidity, against the roughly 25% the Sahara averages, so drinking water changes how rough you feel by a wide margin. It simply doesn't move your clock by a single minute. You can step off the plane perfectly hydrated and still be thoroughly jet-lagged, which catches people out every time.

What genuinely helps

If you only fix one thing, fix your light. Timed daylight is the master switch here, and it isn't close: outdoor light runs from a couple of times brighter than a lit room on a filthy overcast day to hundreds of times brighter in open sun, and its whole effect turns on timing. Catch it before your body's daily low point and you push the clock later; catch it after and you pull it earlier. Get the hour wrong and you slide backwards, which is precisely why a real plan beats winging it. If you read one more thing after this, make it Light: The Most Powerful Jet-Lag Lever.

Melatonin is the other one with real evidence, and it's the awkward one, so it gets its own article rather than a line here. Short version: taken close to your target bedtime at the destination it does reduce jet lag on flights of five zones or more, taken at the wrong hour it moves your clock the wrong way, and what you can legally buy depends entirely on which country you're standing in. Melatonin and Jet Lag: What the Science Says has the detail.

Caffeine is the reliable sidekick. It won't drag your clock across time zones the way light does; what it does is keep you upright through the local day so you're properly tired at local bedtime, which is what makes the schedule stick. A coffee on your new morning reinforces the shift and burns off that arrival-day fog everyone knows. Drink it too late, though, and it sabotages the night. Caffeine hangs around for hours, half of it still in you five or six hours on, and in one well-known study 400mg, about two to three cups, taken six hours before bed cut people's measured sleep by over an hour, with the sleepers themselves never clocking the damage. So enjoy it early and cut it off a good six to nine hours before you want to be asleep. There's more on the timing in Caffeine and Jet Lag.

Shifting your sleep is the quiet one. Move your bedtime and wake time toward destination hours and let light do the heavy lifting on your actual clock. When the afternoon slump hits and you're truly flagging, one short nap of twenty to thirty minutes will keep you upright, provided you keep it early in the day and short, or it'll steal from that night's sleep and set you back.

Comfort tricks worth doing regardless

None of what follows will shift your clock, and every bit of it makes the trip more bearable, which is reason enough. Skip the in-flight wine, tempting as it is, because alcohol suppresses the REM sleep you actually need in the first half of the night and tears up the back half. Keep sipping water, for the reasons above. Sleep somewhere cool if you can, roughly 16 to 19°C, since that helps the natural dip in body temperature that tips you into sleep, and a warm shower an hour or two before bed nudges the same dip along nicely. Feeling comfortable is a perfectly good goal on its own. Just don't mistake it for having reset anything.

Fun fact

That famous anti-jet-lag diet has an unlikely birthplace. It came out of Argonne National Laboratory, a US government research lab far better known for nuclear reactors and particle physics than for travel tips. For years, jet-lagged travellers were following meal-timing advice dreamed up by the same sort of institution that splits atoms.

How the Jet Lag Planner keeps it honest

The Jet Lag Planner is built on exactly the levers that earn their keep, light, caffeine, and sleep timing, and when the evidence for something is thin it says so rather than dressing it up as a miracle. It deliberately leaves melatonin protocols out, not because the evidence is weak (it isn't) but because what you can legally buy differs at every border and a dose is a clinician's call, and it will tell you plainly when a shift is too small to be worth the effort. If you want the full method rather than only the myth-busting, How to Beat Jet Lag: A Science-Based Guide walks through all of it, and the planner itself is free to use.

Sources

General wellness information, not medical advice. Talk to a clinician before changing your schedule if you have a sleep or health condition.

Last reviewed August 5, 2026.

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General wellness information, not medical advice. Talk to a clinician before changing your schedule if you have a sleep or health condition. © 2026 XOR Limited.