Drinking a cup of herbal tea has long been promoted as a natural sleep aid. Research evidence backs this up. Drinking chamomile tea may increase your levels of glycine, a chemical that acts as a mild sedative (Jung, 2014). This helps you relax and achieve sleep more quickly.
Selenium is a mineral that is involved in the biochemical pathway that produces thyroid hormone (Deans, 2014). Thyroid imbalances can lead to sleep changes and lack of restful sleep. A diet that is low in selenium may make you more likely to have sleep problems. Brazil nuts are one of the best known sources of selenium, with one serving of the nuts containing 500 micrograms of the nutrient (Deans, 2014).