A new study found significant correlation between excessive daytime sleepiness and vitamin D – in patients with normal vitamin D levels, progressively higher levels of daytime sleepiness were correlated inversely with progressively lower levels of vitamin D.

But among patients with vitamin D deficiency, sleepiness and vitamin D levels were associated only among black patients.This correlation was observed in a direct relationship, with higher vitamin D levels associated with a higher level of sleepiness among black patients.

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