Here are some studies about vitamin D and sleep:

Plasma Vitamin D Deficiency Is Associated With Poor Sleep Quality and Night-Time Eating at Mid-Pregnancy in Singapore (2017)

Conclusion: A study of 1,152 pregnant women found that those who were vitamin D-deficient had higher incidences of poor sleep quality compared to women with sufficient vitamin D levels.


Association Between Serum Vitamin D Levels and Sleep Disturbance in Hemodialysis Patients (2017)

Conclusion: A study of 141 hemodialysis patients found that those with lower vitamin D levels experienced lower sleep quality compared to those with higher vitamin D levels.


Vitamin D and Actigraphic Sleep Outcomes in Older Community-Dwelling Men: The MrOS Sleep Study (2015)

Conclusion: In a study of 3,048 elderly men, those with lower vitamin D levels were found to have lower sleep quality compared to men with higher vitamin D levels.


Improvement of Pain, Sleep, and Quality of Life in Chronic Pain Patients with Vitamin D Supplementation (2013)

Conclusion: In a study of 28 U.S. military veterans suffering from chronic pain, vitamin D supplementation was found to be effective for improving their pain levels, sleep quality, and overall quality of life.


Vitamin D, Race, and Excessive Daytime Sleepiness (2012)

Conclusion: 81 sleep patients complaining of sleep problems and daytime sleepiness had their vitamin D levels tested. Among the black patients, but not whites, lower vitamin D levels were associated with worse sleep quality (measured by the Epworth Sleepiness Scale). More than half of all these patients had vitamin D deficiency.


Randomized, DIM Light Controlled, Crossover Test of Morning Bright Light Therapy for Rest-Activity Rhythm Disorders in Patients with Vascular Dementia and Dementia of Alzheimer’s Type (1998)

Conclusion: This study found that bright light therapy (you know… LIKE SUNLIGHT) improved sleep and the sleep/wake cycle of elderly dementia patients.


Suppression of Melatonin Secretion in Some Blind Patients by Exposure to Bright Light (1995)

Conclusion: Blind people need bright light exposure (or sunlight exposure) too, but they’re less likely than other people to go and get it and this can cause problems with their sleep/wake cycle. In this study bright light exposure was found to be helpful for suppressing melatonin in blind people, which is important for waking up your brain up, getting yourself on a good sleep/wake cycle, and reducing insomnia.


Also see studies on vitamin D and 

Chronic Fatigue


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