Waking at 3 a.m.? Magnesium deficiency may be disrupting your sleep via cortisol

Dr Eric Berg explains that regularly waking around 3 a.m. may be caused by magnesium deficiency, which disrupts hormonal balance and triggers a nocturnal cortisol spike. Berg, who suffered from insomnia for years himself, identifies magnesium as the key mineral for sleep regulation. Supplementation or a magnesium-rich diet may help resolve the problem.