Magnesium+melatonin supplement is helping me sleep better

My mom wanted me to try a supplement that included magnesium and a small amount of melatonin, she was taking it herself and suggested I tried it too, in the first 2 nights I slept much better than usual and, even though the effect diminished substantially after those 2 days, I'm still managing to sleep better, one of the main things that disrupted my sleep were restless legs and tense jaw muscles, after thaking the supplement I could stay still in my bed with my muscles much more relaxed than usual and for a pretty long time when compared to before, I'm not feeling more awake but definitely less tired, yawning less too.