Most of us take a lot of supplements. If you’re like me, your vanity looks like a pharmacy. The unfortunate truth is, that for a most supplements, there isn’t a lot of scientific evidence to support their efficiency. This doesn’t mean that they’re not helpful, just that there aren’t always double-blind placebo controlled studies to validate them.

It’s been well-proven that Vitamin D is essential to a lot of bodily functions, and that deficiency is linked to many health problems, including: cardiovascular disease, cancer, asthma and cognitive impairment. While deficiencies of essential nutrients will generally cause health problem, it doesn’t necessarily follow that supplementing is beneficial, especially if a deficiency has not been established.

This Study is evidence that vitamin D supplements, even in those not necessarily deficient, helps people fall asleep faster, sleep longer, and provides for a higher quality of sleep.

Given that sleep disturbance is a common symptom of CFS sufferers and other chronically ill people, and that sleep is one of the most important factors in being healthy, there’s plenty of good reasons to keep Vitamin D on your short list of supplements.