various reasons such as dehydration (eg even in the shade, you are losing lots of wayer whzn you go to the beach) but also because sunlight can change how your body produces melatonin which affects your natjral sleep wake cycle.
discussed, with citations, here
https://thesleepdoctor.com/sleep-faqs/why-does-the-sun-make-you-tired/
various reasons such as dehydration (eg even in the shade, you are losing lots of wayer whzn you go to the beach) but also because sunlight can change how your body produces melatonin which affects your natjral sleep wake cycle.
discussed, with citations, here
https://thesleepdoctor.com/sleep-faqs/why-does-the-sun-make-you-tired/
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