Why does hot and humid weather make people sleepy?
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M$3 Answers
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M$
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M$
When temperature rises our blood vessels become constrictive and our blow flow moves to the surface of our skin, to allow the heat to drain off of it faster into a cooler atmosphere, simultaneously to sweating, and this is able to expel 90% of the bodies heat.
Humidity makes a person sleepy because...Their is more water vapor in the air when the humidity is the highest. 100% humidity means its raining. When its dryer the body is able to expel its body heat faster in dryer air than it is in moist air because the moisture .. acts like a blanket keeping the body heat in.
The Sweating causes more water loss, leads to dehydration which also increases fatigue... and the continue loss of water also expels from the body dissolved chemicals like Sodium chloride, salt.. and depletes the body of water which leads to thickening of the blood.. requiring harder work and pressure to pump it through the body, adding strain on the heart, and blood vessels.
The combination of both can kill people with heart diseases, and lead people to heatstroke.
As you can tell by all of the above Heat and Humidity make the body work extra hard, to keep at a good temperature and is very tiring.
Summer Discomfort mixing heat and humidity
http://islandnet.com/~see/weather/life/heat.htm
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M$
This is incredibly wrong.
Heat causes vasodilation (http://en.wikipedia.org/wiki/Vasodilation) "Vasodilation occurs in superficial blood vessels of warm-blooded animals when their ambient environment is hot".
"The opposite physiological process is vasoconstriction".
"Vasodilation is the result of relaxation in smooth muscle surrounding the blood vessels. This relaxation, in turn, relies on removing the stimulus for contraction."
Thus vasodilation (not constriction) is what allows the release of heat through the skin in warm blooded animals.
You do have a point regarding the innability to evaporate the sweat off the skin but it may not be enough to produce sleepyness.
good comment. and it raises the body temperature, sometimes. you feel sick, like you have the flu
I don't think this answer is good enough. There isn't any source and we are talking about a health related issue. I know you can do much better, give it a try and win this one.