Taking magnesium 30 to 60 minutes before bed strengthens your body's natural sleep signal and helps you fall asleep faster Magnesium supports calming brain chemicals and melatonin, which helps quiet a "busy mind" and stabilize your sleep cycle Low magnesium levels are common and leave your nervous system stuck in an overstimulated state that disrupts deep sleep Using magnesium at the same time each night trains your brain to expect sleep, making your bedtime routine more effective Pairing proper magnesium timing with consistent daily habits like morning light exposure and a regular bedtime improves how well you sleep and how rested you feel