Magnesium and sleep are linked through several mechanisms. Magnesium acts as a cofactor for GABA synthesis, a neurotransmitter that promotes relaxation and sleep. It also modulates NMDA receptor activity and influences melatonin production. Observational studies suggest that adequate magnesium intake can reduce sleep onset latency and improve sleep quality, especially in older adults or those with deficiency. However, large-scale randomized controlled trials are limited. Before supplementing, a blood test is advisable to assess actual deficiency. Excessive magnesium can cause diarrhea and gastrointestinal discomfort. Sleep problems often have multiple causes, including stress, caffeine, and poor sleep hygiene, so magnesium is not a standalone solution.
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