15. Improves Sleep
Vitamin D has also been found to play an important role in improving quality of sleep. People with optimal levels of vitamin D have been found to have longer sleep durations compared to those who have deficiencies of the vitamin.
Additionally, people with severe sleep apnea, a condition where proper oxygenation of the brain is hindered by an obstruction of the airways during slumber, have been found to have low levels of vitamin D.
