Every study we read on this question

Trials in people (7)

• 8-week trial in 290 adults with diabetes: magnesium and potassium lowered insomnia scores
  Randomized trial2024290 peoplePoints to benefit
• 6-week trial in 40 adults taking fluoxetine: added magnesium lowered depression scores more
  Randomized trial202640 peoplePoints to benefit
• 1-month trial in adults with fibromyalgia: magnesium did not clearly change stress or sleep
  Randomized trial2022No difference
• 5-day trial in 60 adults after heart surgery: magnesium gave better sleep scores
  Trial, not randomized202260 peoplePoints to benefit
• 2-month trial in 75 adults with restless legs: magnesium or vitamin B6 improved sleep
  Randomized trial202275 peoplePoints to benefit
• 60-day trial in 175 adults with leg cramps: sleep quality improved more with magnesium
  Randomized trial2021175 peoplePoints to benefit
• 7-week trial in 96 older adults: no clear sleep difference between magnesium and placebo
  Randomized trial201096 peopleNo difference

Population studies (3)

• Study that followed 613 adults: magnesium supplements linked to less insomnia, only without diabetes
  Population study: followed a group2026613 peopleMixed
• Study that followed 3,887 Swiss adults: no clear link between magnesium supplements and sleep
  Population study: followed a group20263,887 peopleNo difference
• Survey of 20,585 US adults: magnesium depletion score linked to sleep trouble, not insomnia
  Population study: one-time survey202420,585 peopleMixed

Blood and genes (3)

• Gene study in large databases: genetically higher blood magnesium linked to lower insomnia risk
  Gene study (Mendelian randomization)2025Points to benefit
• Gene study of 15 blood nutrients: no clear link to sleep length or insomnia
  Gene study (Mendelian randomization)2025No difference
• Study of 82 adults with fibromyalgia: poor sleep went with lower blood magnesium
  Blood level study202582 peoplePoints to benefit

Reviews (3)

• Review of 12 trials found mixed results for magnesium and sleep, with weak evidence
  Systematic review2026Mixed
• Review of 9 studies: magnesium linked to sleep in surveys, but supplement trials disagreed
  Systematic review20237,582 peopleMixed
• Pooled review of 3 trials: magnesium shortened falling asleep, but total sleep unclear
  Pooled review (meta-analysis)2021151 peopleMixed