Well the good new is a resting of 60-65, that's agreat HR, suggests to me a strong cardiovascular... but why the higher HR when active, this suggests the opposite.
Metoprolol (any beta blocker) can cause dreams, described as "vivid". I have that problem myself, but I take a much larger dose of BB, 100 mg... and as much as 100 mg twice a day. Still, I am not sure the BB is causing the dreams, even on my part. But, it dreaming started when you went on BB, it is the likely cause.