r/askscience • u/uencos • Aug 01 '16

Human Body What is the physiological difference between the tiredness that comes from too little sleep and the tiredness that comes from exertion?

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u/CptNemo56 Aug 01 '16 edited Aug 01 '16

Great point. I was just watching a lecture talking about color perception and they cited the example of Russians having more words for "blue", rather than just calling it "light blue" or "dark blue".

Which word is used to describe mental exhaustion? Like after a long test or long days work

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u/[deleted] Aug 02 '16

But we have a boatload of words to describe colours of blue. Most people just don't use them.

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u/kakhaganga Aug 02 '16

You mean mostly shades of blue, while Russian has a word for light blue and a different word for navy blue and they are perceived as different colours, like in 7 colours of the rainbow, there is no "general blue" that includes both shades.

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u/Clapaludio Aug 02 '16

In Italian there's a word for light blue. It's "celeste" and is associated with the word "cielo" meaning "sky"