Magnesium is well known as relaxation mineral. There are several theories based on research which explain how deficiency of magnesium can affect sleep. Magnesium helps in functioning of GABA receptors in the brain which is important in transitioning body to restful state. It also helps to stimulate nerves of parasympathetic system which aids in relaxation and calmness.
Relaxing of muscles and stimulation of GABA neurotransmitter can contribute towards good sleep. Deficiency of magnesium can cause major sleep issues including insomnia. Furthermore, deficiency of magnesium can cause decreased levels of melatonin, a sleep hormone.