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That's what it is. Do you know what makes you so tired after being in the sunlight for a while?

The increase in your body temperature from the sun makes you feel tired. Also, some people start to dehydrate which can make you tired. You can read more about the sunlight making you tired https://www.scientificamerican.com/article/why-does-being-in-the-heat-make-us-feel-tired/.

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