Magnesium glycinate, racing heart, and a rough night of sleep.

Last night I took 400 mg of mag glycinate before bed and had a hard time with sleep. To preface this, I had a lot of blood work and cardiovascular tests last year and all were normal.

Basically I woke up several times feeling tense, my heart was racing a bit (not at an extreme level, just elevated), and I could feel it beating some depending on how I was positioned.

My goal in taking this was to help with sleep and for things like anxiety and racing heart situations ironically enough; last night was just unusually active in this regard. I’m a healthy guy, early thirties, no major medical stuff. Battled some anxiety last year due to my mother passing tragically and a couple other big life events.

Have you heard of this type of side effect with mag glycinate? Looking through the sub, I noticed a few similar stories. Any help appreciated.

Edit: actually 400 mg after checking.