New research published in Sleep found that low vitamin D levels were strongly associated with worse outcomes of sleep duration and efficiency in adult men.

In the late 20th century, vitamin d researchers studying the brain discovered potential mechanisms for a role for vitamin D in sleep. More specifically, they found vitamin D receptors on neurons in the brand regions responsible for the initiation and maintenance of sleep.

Ostensibly, this suggests that vitamin D may bind to the receptors in these brain regions and play a role in sleep and sleep quality.

Research on vitamin D and sleep in human populations, however, is limited. These studies are mostly observational and based on subjective, or self-reported, measures of sleep outcomes, which is a fundamental limitation in this research.

In a first-of-its-kind study, researchers from various centers throughout the United States conducted a study that looked at the relationship between circulating vitamin D levels and objectives, or direct, measurements of sleep outcomes.

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