Low levels of vitamin D has been linked to poor sleep quality. You can absorb vitamin D through sunlight or through your diet. If you’re not able to regularly get vitamin D, consider taking vitamin D3 supplements, especially during winter months when you are less likely to get the sun exposure you need.
The science: Studies suggests that vitamin D deficiency is associated with sleep disorders (McCarty et al., 2014). Vitamin D receptors are located in parts of the brain typically associated with sleep. A study performed in 2017 found that vitamin D supplements made it easier to fall asleep, increased sleep quality, and increased sleep duration in 20-50 year old people with sleep disorders (Majid et al., 2017).