Spring fever may be shrouded in myth but it’s as factual—and relevant—as its antithesis, seasonal affective disorder. If you feel a natural rise in your mood the moment the winter weather warms, trust that it’s not all in your head—or, rather, it’s mostly in your head, but in a completely different way than the cliché suggests: The longer days, shorter nights, clearer skies and balmier temps impact everything from melatonin production to energy levels, giving many a whole season of more pep in their step and pure, unfettered happiness.

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