Unless you are driving, you dont do anything but sleep, eat and watch movies and we still get so tired.
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You’re not really relaxing your body and muscles fully in a moving vehicle. Your body is constantly adjusting to maintain balance and in my experience, also is a bit tensed up. But it’s hard to notice when you’re in motion. I first noticed it when on a long distance bus and when we were in stop and go traffic. My legs would involuntarily tense up almost imperceptibly each time we’d move again and relax fully each time we stopped. It all made sense suddenly.
As for planes, I’d say it’s because the inside of a plane is designed to be as barely comfortable as possible without killing you.
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