I’m 77. Jan 23 was diagnosed with Afib. A cardiologist put me on 50 mg losartan,50 mg metoprolol, and Elequis. I could barely walk thru my house. I also started sleeping issues. The cardiologist said “you are having nightmares. Let’s cut metoprolol to 25 mg.” I didn’t think I was having nightmares but added a sleep app to my cell phone. Sure enough, I was calling for help, moaning in my sleep. Finally he said no more metoprolol. I told my GP and he had never heard of it. Looked it up and said, “yes, it can cause nightmares.” It also causes fatigue. Discuss your symptoms with the Dr. There may be options.