Comment by pedalpete

A self reported insomnia study has very poor accuracy. There is no reason in this day and age they are not using a sleep tracker to measure sleep onset.

Also, there is a correlation between potassium and magnesium levels, and they measured potassium intake, but no mention of magnesium. It is possible that the subjects with highest potassium intake also had higher magnesium levels.

I'm not saying the study is wrong, but it does make a good point to the people taking magnesium to help sleep, they should also be taking potassium. I'll be trying that over the next little bit.