Magnesium is not a "sleep trick."
It is an essential mineral your body already depends on every day.
Your body uses magnesium to support normal nerve function, muscle function, energy production, protein synthesis, and bone health. That matters because sleep is not just about your mind turning off — your entire body has to shift into a calmer state.
When your nervous system and muscles are still tense, it can be harder for your body to fully settle down. Magnesium helps support the normal functions your body uses to relax, regulate, and recover. The NIH says magnesium is involved in more than 300 enzyme systems, including processes related to muscle and nerve function, blood glucose control, blood pressure regulation, and protein synthesis.