Nature's ingredient that is found in milk and superfoods such as soy etc. It helps to induce sleep. That's why mom's say drinking a glass of warm milk helps you to fall asleep.

How does theanine work for sleep? L-Theanine, an amino acid naturally found abundant in tea leaves, has anxiolytic effects via the induction of α brain waves without additive and other side effects associated with conventional sleep inducers. Anxiolysis is required for the initiation of high-quality sleep.

Glycine is an amino acid, a compound that your body uses to create protein. While your body does naturally produce glycine, it is also available through protein-rich foods, particularly fish. In one study, a group of subjects was given glycine before bed while another group was given a placebo. The group that took glycine reached slow-wave sleep more quickly. This research shows that taking glycine helps you reach deep sleep more quickly and improves your quality of sleep by stabilising your sleep rhythms.