It is a powerful chronobiotic and can be used to treat sleep-wake circadian rhythm disorders, but it is not effective for sleep disorders. How it works is not well understood. Other modalities, such as certain supplements or massage therapies, may risk interfering with other medications or treatments (or be unsafe for certain groups). As harmless as an approach may sound, it’s a good idea to tell your doctor what you’re trying (especially if you’re currently undergoing other treatments for sleep disorders or have another chronic health issue). Research shows mixed evidence of tryptophan’s effectiveness.
It helps regulate the sleep-wake cycle in the brain.