{"id":29235667,"date":"2026-10-23T10:47:54","date_gmt":"2026-10-23T08:47:54","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/why-jet-lag-worse-flying-east-circadian-rhythm\/"},"modified":"2026-10-23T10:48:09","modified_gmt":"2026-10-23T08:48:09","slug":"why-jet-lag-worse-flying-east-circadian-rhythm","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/why-jet-lag-worse-flying-east-circadian-rhythm\/","title":{"rendered":"Why Jet Lag Is Worse Flying East, and What Actually Helps"},"content":{"rendered":"\n<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\n\n\n<!-- mfsh:top -->\n\n<style>\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid #0F1720;background:#fff;color:#0F1720;font-family:inherit;font-size:14px;font-weight:700;line-height:1;letter-spacing:0;text-transform:none;cursor:pointer;box-shadow:none;transition:background .15s,color 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Fly back and you arrive tired, but somehow it is easier to shake off. That is not your imagination, and it is not just the airline seat. Jet lag really is worse when you fly east.<\/p><p>The reason lies in a tiny cluster of cells in the brain that keeps time, and in the awkward fact that, left to itself, that clock does not run on a 24-hour day.<\/p>\n\n\n\n<div style=\"background:#f4f6f9;border-left:4px solid #5C91FF;padding:18px 22px;margin:28px 0\"><p style=\"margin:0 0 10px;font-weight:700;color:#0d1117;font-size:17px\">Quick Facts<\/p><p style=\"margin:5px 0;font-size:15px;color:#333\"><strong>What it is:<\/strong> A temporary mismatch between your body clock and local time after crossing time zones<\/p><p style=\"margin:5px 0;font-size:15px;color:#333\"><strong>Master clock:<\/strong> The suprachiasmatic nucleus in the hypothalamus<\/p><p style=\"margin:5px 0;font-size:15px;color:#333\"><strong>Usually noticeable:<\/strong> After crossing about three or more time zones<\/p><p style=\"margin:5px 0;font-size:15px;color:#333\"><strong>Rule of thumb:<\/strong> Roughly one day to adjust per time zone crossed<\/p><p style=\"margin:5px 0;font-size:15px;color:#333\"><strong>Harder direction:<\/strong> Eastward: the clock must advance (shorten the day)<\/p><p style=\"margin:5px 0;font-size:15px;color:#333\"><strong>Strongest reset cue:<\/strong> Light, timed to the direction of travel<\/p><p style=\"margin:5px 0;font-size:15px;color:#333\"><strong>Main symptoms:<\/strong> Poor sleep, fatigue, poor concentration, headaches, digestive upset<\/p><\/div>\n\n\n<h2 style=\"padding-top:22px\">Your body clock runs a little slow<\/h2>\n\n\n<p>Your internal clock sits in the suprachiasmatic nucleus of the hypothalamus. Every day it is nudged back into line with the outside world, mainly by light. Without those cues, studies of people living in isolation show that the clock drifts, because its natural period is slightly longer than 24 hours. Estimates range from about 20 minutes to around half an hour more.<\/p><p>That small offset makes the two directions very different. Flying west, you need to stay up later and lengthen your day, which goes with the clock&rsquo;s natural tendency. Flying east, you need to go to bed earlier and shorten your day, which works against it.<\/p>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><div><em>&ldquo;more difficult to go to sleep earlier than you usually do, rather than later&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Dr. Charles Czeisler<\/strong> &mdash; sleep researcher, Brigham and Women&rsquo;s Hospital, as quoted by STAT<\/div><\/div><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/why-jet-lag-worse-flying-east-circadian-rhythm-img1.jpg\" alt=\"Map of the standard time zones of the world\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Every time zone crossed is roughly another day of adjustment. (U.S. Central Intelligence Agency map, 2015, public domain)<\/figcaption><\/figure>\n\n\n<h2 style=\"padding-top:22px\">The physics of a bad night<\/h2>\n\n\n<p>In 2016, a team led by physicist Michelle Girvan at the University of Maryland modelled the brain&rsquo;s pacemaker cells as a network of oscillators, published in the journal Chaos. Their model, as reported by ScienceAlert, predicted that recovering from a three-time-zone trip takes a little under four days going west but more than four days going east, and that six time zones takes about six days west but eight days east.<\/p>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><div><em>&ldquo;Our model suggests that the difference between a person&rsquo;s natural period and 24 hours controls how they experience jet lag.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Michelle Girvan<\/strong> &mdash; physicist, University of Maryland<\/div><\/div><\/div>\n\n\n\n<p>It is not only the brain. Organs such as the liver have their own clocks, which resynchronise at different speeds from the master clock. For a few days after a long flight, different parts of the body are effectively living in different time zones, which helps explain the fog, the poor appetite and the upset stomach.<\/p>\n\n\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0 8px\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/u6Et79cSfmw\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div><p style=\"font-size:13px;color:#777;text-align:center;margin:0 0 24px;font-style:italic\">A long-haul airline captain explains how he deals with jet lag (Captain Joe).<\/p>\n\n\n<h2 style=\"padding-top:22px\">What actually helps<\/h2>\n\n\n<p>Light is the most powerful tool. Morning light tends to advance the clock, which is what you want after flying east; evening light tends to delay it, which helps after flying west. The timing matters: the wrong light at the wrong time can push the clock the wrong way, which is why many travellers now use apps that calculate a personal light schedule.<\/p><p>Shifting your sleep by an hour or two in the days before departure can shorten the adjustment. Melatonin, taken in the late afternoon or evening, can help advance the clock, though its effect depends on dose and timing, and it is worth checking with a doctor first. Short-acting sleeping pills help some people sleep but do nothing to move the clock itself. Alcohol and heavy caffeine generally make things worse.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/10\/why-jet-lag-worse-flying-east-circadian-rhythm-img2.jpg\" alt=\"Airliner wing above the clouds in blue dawn light\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Dawn over the wing. On an eastbound flight, that first morning light at the destination is the best medicine. (Photo: Brian Gaid \/ CC0)<\/figcaption><\/figure>\n\n\n<h2 style=\"padding-top:22px\">How airline crews live with it<\/h2>\n\n\n<p>For long-haul pilots and cabin crew, jet lag is not a holiday nuisance but a safety issue, and airlines operate under flight and duty time rules designed to manage fatigue. Many crews on short layovers deliberately stay on home time rather than adapting, because by the time their body clock has adjusted they would be flying back.<\/p>\n\n\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0 8px\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/jFLCbRaxMb8\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div><p style=\"font-size:13px;color:#777;text-align:center;margin:0 0 24px;font-style:italic\">Pilot Minute: the Federal Aviation Administration on what jet lag is and how to prevent it.<\/p>\n\n\n\n<p>For the rest of us, the lesson is simple. Going west, stay up and enjoy the long evening. Going east, get outside into the morning light, resist the afternoon nap and accept that your body is a few hours behind the rest of the plane for a while.<\/p>\n\n\n\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0 8px\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/RHnI_P2WfKw\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div><p style=\"font-size:13px;color:#777;text-align:center;margin:0 0 24px;font-style:italic\">Why jet lag is worse when you travel east rather than west (WFAA Verify).<\/p>\n\n\n\n<p><em>Sources: Wikipedia (Jet lag), STAT News, ScienceAlert, Chaos (2016), CDC Yellow Book, Federal Aviation Administration<\/em><\/p>\n\n\n\n<!-- mfsh:bottom -->\n\n<button type=\"button\" class=\"mfsh-trigger mfsh-bottom\" data-mfsh-placement=\"bottom\" aria-haspopup=\"dialog\"><svg><use href=\"#mfsh-i-share\"\/><\/svg>Share this story<\/button>\n\n<!-- \/mfsh:bottom -->\n\n\n\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\n\n\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>Why is jet lag worse when flying east?<\/summary><div class=\"a\">Flying east means going to bed earlier and shortening your day, which requires the body clock to advance. The human body clock naturally runs slightly longer than 24 hours, so it delays easily but advances slowly. That makes eastward jet lag harder to shake off than westward jet lag.<\/div><\/details><details><summary>How long does jet lag last?<\/summary><div class=\"a\">A common rule of thumb is about one day of adjustment for every time zone crossed. A University of Maryland model predicted that six time zones takes about six days going west but eight days going east.<\/div><\/details><details><summary>What causes jet lag?<\/summary><div class=\"a\">Jet lag happens when your internal clock, centred in the suprachiasmatic nucleus of the brain, is out of step with local time after rapid travel across several time zones. Clocks in other organs adjust at different speeds, which adds to symptoms such as fatigue and digestive upset.<\/div><\/details><details><summary>What is the best way to beat jet lag?<\/summary><div class=\"a\">Timed light exposure is the most effective tool: morning light after flying east and evening light after flying west. Shifting sleep by an hour or two before departure can also help. Melatonin can help advance the clock, but dose and timing matter, so check with a doctor.<\/div><\/details><details><summary>Does crossing the International Date Line cause jet lag?<\/summary><div class=\"a\">No. Jet lag depends on how many time zones you cross east or west, not on the date change. A long north-south flight within the same time zone may cause tiredness but not jet lag.<\/div><\/details><details><summary>How do airline pilots deal with jet lag?<\/summary><div class=\"a\">Airline crews fly under flight and duty time rules designed to manage fatigue. On short layovers, many long-haul crews stay on their home time rather than adapting to the destination, because their body clock would barely adjust before they fly back.<\/div><\/details><\/div><\/section>\n\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Why is jet lag worse when flying east?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Flying east means going to bed earlier and shortening your day, which requires the body clock to advance. The human body clock naturally runs slightly longer than 24 hours, so it delays easily but advances slowly. That makes eastward jet lag harder to shake off than westward jet lag.\"}},{\"@type\":\"Question\",\"name\":\"How long does jet lag last?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A common rule of thumb is about one day of adjustment for every time zone crossed. 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On short layovers, many long-haul crews stay on their home time rather than adapting to the destination, because their body clock would barely adjust before they fly back.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/go-pills-no-go-pills-dexedrine-modafinil-ambien-usaf-aircrew\/\">Dexedrine and Ambien: The Go Pills and No-Go Pills USAF Aircrew Carry<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/when-fatigue-kills-the-hidden-safety-crisis-in-wartime-flying\/\">When Fatigue Kills: The Hidden Safety Crisis in Wartime Flying<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/why-airplane-cabins-are-pressurised-to-6000-feet-not-sea-level\/\">Why Airplane Cabins Are Pressurised to 6,000 Feet, Not Sea Level<\/a><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Share this story Fly from New York to London overnight and you land at breakfast time feeling as if someone has stolen a night of your life. Fly back and you arrive tired, but somehow it is easier to shake off. That is not your imagination, and it is not just the airline seat. Jet [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":29235649,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-29235667","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why Jet Lag Is Worse Flying East | MiGFlug<\/title>\n<meta name=\"description\" content=\"Why is jet lag worse flying east? Your body clock runs a little longer than 24 hours, so it delays easily but advances slowly. 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