Is vitamin D the reason you can't sleep at night?

March 7, 2015
Volume 5    |   Issue 20

A doctor friend of mine recently told me an incredible story about vitamin D. And it could explain why some people suffer with insomnia when they take this vitamin.

My friend was looking at some of my lab results and he noticed that my vitamin D levels were in the optimal range (over 70 ng/ml or 175 mnol/l). He asked, "Have you been taking vitamin D?" When I told him I was, he asked how much. I said, "5,000 IU daily." He said it was perfect. Then he went on to tell me the story.

He told me that he was shocked when he saw the lab results of one of his patients. His vitamin D level came in at 120 ng/ml or 300 mnol/l. That's extremely high. But what was incredible about the story was that the patient had experienced only one side effect from having such high vitamin D levels — he didn't sleep anymore. He didn't feel tired, he functioned normally, and he could keep going far better than he had before. The only problem was that after a while, he noticed dark bags forming under his eyes, so he decided to cut back so he could get some sleep.

I suspect that if he had continued taking vitamin D at this level, he would have had other issues. The issues probably wouldn't come from the vitamin D, but from a lack of sleep. The body needs to rest. But this story gives us some interesting insights into vitamin D and insomnia.

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We know that people who are deficient in vitamin D often suffer with depression, fatigue, and low energy levels. What's more, they also can suffer with insomnia because the low energy during the day messes up their sleep rhythms at night. When they start taking vitamin D, they often feel a strong burst of energy within a few weeks. This burst of energy typically levels off once their blood levels get into a normal area. But they also sleep better at night. So if you're lacking energy and not sleeping well, you may want to have your vitamin D levels checked (or just start taking vitamin D).

Some people are on the other end of the spectrum. Like the patient in our story, they have trouble sleeping because they're taking too much vitamin D. This is pretty hard to do. Most people don't need to take more than 5,000 IU daily to reach optimal levels. But there are people who take 10,000 IU daily with no trouble. So it's unlikely you're in the same boat as this patient. But if you're having trouble sleeping and you take a lot of vitamin D, it's something to consider.

It's far more likely that you're taking your vitamin D at the wrong time of day. If you're taking vitamin D before you go to bed, it might be giving you an energy boost that's making it hard to sleep. This is easy to remedy. All you need to do is take your vitamin D when you wake up in the morning. This makes sense, as the sun helps generate vitamin D in our body. So why not take the supplement when your body would normally want it?

You can order a high quality 5,000 IU vitamin D by following this link.

Your insider for better health,


Journal of Cardiovascular Pharmacology, June 7, 2010.

"American Journal of Hypertension"; Oral L-Citrulline Supplementation Attenuates Blood Pressure Response to Cold Pressor Test in Young Men; A Figueroa, et al.; 2009.

Steve Kroening

Steve Kroening is the editor of Nutrient Insider, a twice-a-week email newsletter that brings you the latest healing breakthroughs from the world of nutrition and dietary supplements. For over 20 years, Steve has worked hand-in-hand with some of the nation's top doctors, including Drs. Robert Rowen, Frank Shallenberger, Nan Fuchs, William Campbell Douglass, and best-selling author James Balch. Steve is the author of the book Practical Guide to Home Remedies. As a health journalist, Steve's articles have appeared in countless magazines, blogs, and websites.

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