“Magnesium helps you sleep better.”
The cited review included only three trials and 151 older adults. Evidence quality was low to very low; a possible improvement in time to fall asleep did not establish a reliable general sleep benefit.
Small trials in older adults suggest magnesium might shorten time to fall asleep, but total sleep time did not clearly improve. Evidence is too uncertain to call it an established sleep treatment.
Safety note: Supplemental magnesium can cause diarrhea. Kidney impairment increases toxicity risk, and magnesium can interfere with some medicines.
Talk to a healthcare professional if: Ask a clinician before supplementing if you have kidney disease; ask a pharmacist about interactions. Seek assessment if sleep problems persist or impair daytime function.
Do not assume that a magnesium supplement will solve a sleep problem. The small older-adult trials do not establish benefit for everyone.
If considering a supplement, review your medicines and kidney health first. Persistent insomnia deserves assessment rather than repeated supplement trials.