Definition of demo written for English Language Learners from the Merriam-Webster Learner's Dictionary with audio pronunciations, usage examples, and count/noncount noun labels. Learner's Dictionary mobile search
Magnesium deficiency is often a precursor to sleep disorders, such as anxiety, hyperactivity and restlessness. Itâs been suggested that this is because magnesium is vital for GABA function, an inhibitory neurotransmitter known to âcalmâ the brain and promote relaxation.
1 A deficiency in magnesium can cause painful leg cramps, migraines, and also insomnia. 2  Potassium: Potassium is another important mineral, the lack of which can cause fatigue, muscle tightness, and cramping. 3  It is naturally available in bananas, nuts and tomatoes.