Persistent sleep disorders affect millions of people in the United States every year. Ongoing sleep problems and the resulting lack of rest can disrupt job performance, driving safety, social interactions, and overall well-being. In some cases, poor sleep may also contribute to significant health concerns. To cope, many individuals explore complementary approaches such as relaxation practices or melatonin supplements in hopes of getting better rest.

More recently, magnesium has become a popular topic online and on social media, where it is often promoted as a key ingredient in so-called “sleepy girl mocktails” because of claims that it supports better sleep. Despite this trend, scientific evidence on magnesium supplements for insomnia and other sleep-related conditions remains limited. At this time, there is not enough strong research to clearly determine whether magnesium is truly effective for improving sleep disorders.

• For instance, a 2021 review that evaluated 3 studies involving 151 participants suggested that magnesium might reduce sleep-onset latency—that is, the amount of time it takes to fall asleep—in older adults with insomnia. However, the reviewers emphasized that the available studies were small and of low quality, making it difficult to draw reliable conclusions or confidently recommend magnesium for this purpose.

• Another review examined 9 studies with a total of 7,582 participants and found mixed results regarding magnesium’s impact on sleep quality and sleep disorders. Some research indicated that higher magnesium intake was linked to outcomes such as daytime drowsiness, falling asleep during the day, snoring, and longer sleep duration among healthy adults. However, these studies did not show clear improvement in symptoms of diagnosed sleep disorders. Other small studies suggested possible benefits for self-reported sleep quality, sleep efficiency, and total sleep time, but most were limited in size and methodological strength. Overall, the authors concluded that larger, well-designed randomized clinical trials lasting longer than 12 weeks are necessary to better understand magnesium’s potential role in sleep health.

Magnesium from dietary supplements or medications should not be taken above the established upper intake level unless advised by a health care provider. Excessive magnesium intake from supplements can lead to side effects such as diarrhea, nausea, and abdominal cramping. Extremely high amounts may cause serious complications, including irregular heartbeat and even cardiac arrest.

Additional Resources

Sleep Disorders: In-Depth Overview

Understanding Sleep Deprivation and Deficiency

Sleep and Sleep Disorders

Sleep and Overall Health

Natural Does Not Always Mean Safer or More Effective

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