Vite D and sleep may be an effective way to manage chronic pain, depending on the source/cause of the pain. There appears to be a direct link between D and sleep and pain:

Vitamin D supplements and good night's sleep may help to manage pain

Following a review of published research on the relationship between vitamin D, sleep, and pain, researchers propose that vitamin D supplementation, together with good sleep hygiene, may offer an effective way to manage pain in conditions such as arthritis, chronic back pain, fibromyalgia, and menstrual cramps.

A recent review of existing studies has uncovered a link between vitamin D supplementation, sleep hygiene, and pain management.

The review - by researchers from the Department of Psychobiology at the Federal University of São Paulo in Brazil - is published in the Journal of Endocrinology.

The researchers explain that while the role of vitamin D in bone metabolism is well established, there is also evidence emerging that it takes part in other biological processes, such as processing of sensory signals and sleep regulation.

Another link that is well established is that which ties pain to sleep disturbance. What is not clear, however, is how vitamin D fits into this relationship.

In their review, the researchers look at recent studies that examine the links between vitamin D, sleep, and pain. They also suggest that health professionals should consider these associations when recommending treatments for patients with all types of pain condition, including chronic back pain, fibromyalgia, arthritis, and menstrual cramps.

Cont;

http://www.medicalnewstoday.com/articles/317607.php

Source study

http://joe.endocrinology-journals.or...-0514.abstract