Dreams are an indication of REM sleep, but improvement in REM may be a general indication that you're getting overall better sleep, including deep sleep.

I 100% shill for magnesium when I can, and sleep is a huge reason in my experience. I was recommended it by others for sleep, and I have got a lot of people started. Within a few days our sleep is just so much better, including deeper dreams. I do 100mg lysinate glycinate. My brand's bottle recommends two per serving, but one has worked great. I take it right before bed and have never looked back.

What form of magnesium?

Magnesium glycinate is typically recommended, but any form that doesn't upset your stomach is probably good.

Magnesium L-Threonate (a.k.a. magtein) supposedly crosses the blood-brain barrier better than any other form of magnesium.

I've read that Magnesium L-Threonate is better taken in the morning to help your brain function better during the day. So, I take this in the morning and Mg glycinate at night.

I currently use magnesium oxide in a tablet form (I use half a tablet, ~125mg). I have previously used magnesium glycinate but I don't remember what dose I used of that.

I'll add, the mag oxide always prevents leg cramps when I take a full tablet (250mg) when I am working outside all day (and staying hydrated).

ETA: In my experience magnesium citrate is the one mostly likely to cause diarrhea though they all can.

I use a powdered drink called 'Calm'. It's got a bit of a berry flavor to it. Start with a small amount though or you'll be shitting your pants. There are a lot of studies showing magnesium levels are far too low in people anyway so it's a good idea to supplement it.

I also take Magnesium and swear by it. I also suspect I have some underlying kidney issues retaining many electrolytes and started taking a potassium with the magnesium at bedtime and it has transformed my sleep into baby-land. I sleep so hard now and when I wake up, I have no problem getting right back to sleep. I feel so refreshed the next day it is honestly shocking to me. I have always said that before I started taking both that I felt like I was on a one-way track to dementia. That is just how I felt. Very anecdotal, but I believe it in my bones.

How much of each are you taking? Are you taking any blood pressure medications?

No blood pressure meds.

I take about 150MG of magnesium and 100mg of potassium before bed. The magnesium is Chloride, but in liquid form and causes no laxative effect (but tastes terrible!). It is a product called ReMag. I am sure other forms will work just as well. The potassium is Gluconate as it is PH neutral. Potassium Citrate and Chloride would work just as well. I just get the Gluconate from Walmart as it is cheap and effective.

Magnesium makes it worse for me because you have to pee out a bunch of minerals.