Medical disclaimer: SnoozeVerdict summarizes what people say about sleep supplements on Reddit. It is not medical advice, and nothing here is meant to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the Food and Drug Administration. Talk to your doctor or pharmacist before starting a supplement, especially if you are pregnant, take medicines (including sleep or mood medicines), or have a medical condition. Poor sleep that lasts for months, loud snoring or gasping at night, or falling asleep during the day while driving or working needs a doctor, not a supplement. Full disclaimer.

Question · Staying asleep

Does magnesium help you stay asleep?

Many say yes, going by Reddit owner reports: 20 of 25 rated comments from people who wake up during the night describe a good experience with Magnesium, and 5 describe a poor one. That is self-reported experience, not proof that it works, and results vary from person to person.

Magnesium, Staying asleep	Owner comments
Rated comments in this context	25
Positive	20 (80%)
Negative	5 (20%)
Describe an unwanted effect	2
Context rating (small samples pulled to the average)	3.5

Magnesium (form not stated) overall: 4.2 from 938 owner comments in Reddit sleep, insomnia and supplement communities, May 2026 to October 2026.

What the research says

Magnesium is an essential mineral involved in hundreds of enzyme reactions; many people do not get the recommended amount from food.^{[NIH Office of Dietary Supplements]}
A small 2012 double-blind trial in older adults with insomnia compared 500 mg of magnesium a day with placebo for 8 weeks.^[PubMed]
A 2021 meta-analysis of trials in older adults rated the evidence as low quality.^[PubMed]

Safety

The NIH upper limit for magnesium from supplements is 350 mg a day for adults unless a doctor advises more; higher doses commonly cause diarrhea, and people with kidney disease are at higher risk of magnesium build-up.^{[NIH Office of Dietary Supplements]}
Magnesium can reduce absorption of some antibiotics and osteoporosis drugs, so doses are usually spaced apart.^{[NIH Office of Dietary Supplements]}

Good experiences

4/5 Deeper sleep
“magnesium helped a bit but adding glycine made me actually sleep through the whole night without that 3am wide awake moment”

owner comment via r/sleep · 2026-08-27 · 22 upvotes

4/5 Deeper sleepFalling asleep faster
“I had similar experience with magnesium helping me get sleepy but not staying asleep part.”

owner comment via r/sleep · 2026-06-03 · 11 upvotes

4/5 Fast-actingDeeper sleep
“In terms of supplements, I have found magnesium to be the most helpful for me.”

owner comment via r/sleep · 2026-09-08 · 8 upvotes

Poor experiences

2/5 Falling asleep faster
“This just seems to be a hustle with the magnesium.”

owner comment via r/Supplements · 2026-09-08 · 2 upvotes

2/5 Side effectsFalling asleep faster
“After taking Magnesium Biglycinate, I no longer have this problem.”

owner comment via r/Supplements · 2026-08-04 · 1 upvotes

How reports compare in other contexts

Context	Rated comments	Positive	Negative
Falling asleep	41	37	3
Deep sleep	36	30	3
Morning grogginess	30	12	14
Anxiety at night	23	15	7
Vivid dreams	9	3	4

More on Magnesium

Talk to a doctor about new, severe or lasting symptoms, and to a pharmacist before combining supplements with medicines.