Why does sitting on a plane make you tired?

The U.S. Federal Aviation Administration (FAA) requires airplanes to have a safe level of air pressure in their cabins. However, it's still lower than the air pressure on the ground. This means your body will absorb less oxygen when flying, and as oxygen levels in your blood decrease, you may feel tired and sleepy.



Sitting on a plane makes you tired due to a combination of low oxygen levels, dehydration, and "mental fatigue" from constant low-frequency noise. Even though the cabin is pressurized, the air inside an airplane at cruising altitude is equivalent to the air at 6,000 to 8,000 feet above sea level. This leads to slightly lower oxygen saturation in your blood, making you feel sluggish and sleepy. Furthermore, the humidity in a plane is typically below 10%—drier than most deserts—which causes rapid dehydration and headaches, both of which mimic the symptoms of exhaustion. The constant "white noise" of the jet engines also forces your brain to work harder to filter out the sound, a process that is surprisingly draining over several hours. Finally, the "forced immobility" of being stuck in a small seat slows down your circulation, which can lead to a drop in energy levels. This "travel fatigue" is distinct from jet lag (which is a disruption of your internal clock) and is why even a short, two-hour flight can leave you feeling like you've done a full day of manual labor.

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Practice self-care to avoid post-travel fatigue
Stay hydrated, eat nutritious foods, get some exercise, and try to take it easy on alcohol and caffeine—at least while your body's trying to overcome jet lag.

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Jet lag symptoms usually occur within a day or two after traveling across at least two time zones. Symptoms are likely to be worse or last longer the farther you travel. This is especially true if you fly east. It usually takes about a day to recover for each time zone crossed.

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Jet lag is when your normal sleep pattern is disturbed after a long flight. It usually improves within a few days as your body adjusts to the new time zone.

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Jet belly: (noun) the bloated state in which your stomach inflates post-flight. Also, a very unpleasant feeling. May also make you look like you're 3 months pregnant. So how does one prevent this jet belly? Well, it all depends on what you eat on the plane.

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The Airport and Airplanes are Full of Germs Airplanes are just as dirty. Studies have shown bacteria and viruses living on armrests, seat belts, window shades, tray tables, toilet handles, and more for DAYS.

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Sitting down in a tight seat for 13+ hours can sometimes lead to circulation issues, including swelling in the feet. According to The Healthy, the chance of your body forming blood clots increases when blood isn't moving correctly, such as when onboard a long-haul flight.

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The cramped conditions and long periods of being less active on a flight can cause pain, stiffness or swelling of your legs. Being less active can lead to slow blood flow in your veins which increases your risk of developing a blood clot, known as deep vein thrombosis (DVT).

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The lower-than-normal air pressure in the cabin is known to induce mild hypoxia (reduced oxygen levels in the brain), which is associated with a raft of cognitive and emotional effects, including heightened negative moods and a diminished ability to handle stress.

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Planes have lower oxygen levels If this didn't happen, everyone inside the plane would die, as the low air pressure at the elevations planes fly (typically 35,000 feet or so) means there isn't enough oxygen present for your body to function.

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Low air pressure during air travel also decreases the amount of oxygen in the air. This effect is modest and generally not noticeable for healthy travelers. For patients with significant lung disease, a small decrease in available oxygen can cause significant symptoms, especially with exercise.

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Water might sound like a boring drink to you. But, it will help keep you feeling hydrated and refreshed. There's nothing stopping you from drinking tea or coffee before you board your flight. Just try to avoid doing so while you're in the air.

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Let's start at the beginning: Every surface of an airplane lavatory is supposed to be cleaned with disinfectants and deodorizers after each arrival and during overnight layovers.

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The pilot (or captain as they're called) is able to use the bathroom without any issues. Some airlines even opt to have a special bathroom for the crew installed. For airline pilots it's easy, just leave the cockpit according to protocol, respond to the call of nature and make your way back.

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It's possible that traveler's diarrhea may stem from the stress of traveling or a change in diet. But usually infectious agents — such as bacteria, viruses or parasites — are to blame. You typically develop traveler's diarrhea after ingesting food or water contaminated with organisms from feces.

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It takes about 24 hours before your body begins to eliminate undigested food residue (e.g., waste). So, you've gained a little water weight, not a surplus of fat cells. If you resume your usual healthy diet and drink plenty of water, you'll lose that extra fluid in a couple of days.

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Travel: For some people, sitting for a long time in a car or airplane can cause fluid retention. The lack of circulation allows fluid to build up; however, the swelling usually goes away in a day or two.

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What Effects Does Long-Haul Flying Have On The Human Body?
  • Jet lag. Indeed, the most common symptom of a long-haul journey is jet lag. ...
  • Fatigue. Another common side effect of being airborne for long periods is mild fatigue. ...
  • Ear, nose, and gut problems. Pressurization doesn't just affect oxygen levels. ...
  • Dehydrated skin.


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Some fliers are worried about being in an enclosed space for too long, others dislike heights, and a select group is terrified they might accidentally open a plane door mid-flight. Furthermore, some passengers are worried about germs and viruses and others are just anxious that they might feel anxious on a plane.

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