Magnesium glycinate has become one of the most popular supplements for better sleep. But while some people say it helps them feel more relaxed at night and sleep better, others take it consistently and notice little to no difference. If you’re not seeing the benefits you expected, a few factors may be at play. Magnesium glycinate is generally considered one of the more absorbable forms of magnesium, but certain dietary factors can still affect how much your body takes up.