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"Are you yawning while reading this? (I&amp;#x27;m not offended--I&amp;#x27;m yawning, too. In my case, it was because I had three deadlines that all converged at once, so I stayed up way, way too late. All-nighters should disappear when you graduate from college. Hm, maybe they do for most people.) But there are other reasons you may feel like nodding off way before bedtime, and a new study is suggesting that vitamin D may be one of them. But it&amp;#x27;s complicated. A small study in the Journal of Clinical Sleep Medicine found that lack of vitamin D was found to have a direct association with how sleepy study participants were during the day--unless the participants were African-American, in which case more vitamin D was linked with daytime sleepiness. Researchers speculate that pigmentation found in different races may play a role in how vitamin D affects sleep, but say there&amp;#x27;s a lot more study needed (the research was also performed on study subjects who were eventually diagnosed with sleep disorders). There&amp;#x27;s evidence that vitamin D affects a lot of other things in our bodies, too, of course: helping keep your heart and bones healthy, possibly reducing the risk of breast cancer, plus weight loss and macular degeneration. How do you get your vitamin D? Do you supplement? Do you notice when you&amp;#x27;re low on vitamins? More on vitamins: * Are you a vitamin cop? * Chewable vitamin C--yum * Is it possible to inhale vitamins? Photo: Thinkstock"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.glamour.com/health-fitness/blogs/vitamin-g/2012/12/do-you-get-exhausted-during-th>