Why are long haul trips like airplane rides and bus rides so exhausting, even though all we do is sit?

Question

Why are long haul trips like airplane rides and bus rides so exhausting, even though all we do is sit?

In: Other

Answer 1

Airplane cabins are very very dry, with typically 4-7% humidity. Even mild dehydration can cause fatigue and lethargy. New composite material airplanes like the 787 have higher humidity in the cabin, around 15%, and you feel much better afterwards.