Dehydration may be one aspect. If you’re hydrated, it might be psychosomatic. Remembering working or playing in the sun, and becoming tired? On a normal day you might be actually energetic but talking yourself into being tired prematurely, especially if you aren’t wanting to enjoy outdoor activities.
Behavioral modification and reconditioning may help. Doing activities you enjoy and concentrating periodically on how you’re enjoying the sun.
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