Medication can, at times, bring about nightmares and the user would no doubt jump up in a sweat, panicing and the likes. My doubt is the stage of
sleep. i think you are more experiecning
lucid dreams. they are the type that seem so real, that when we wake up, it takes a few minutes for us to cop onto the fact that it was just a dream. If you were dreaming dogs were attacking you in a lucid dream or anything with pain, you would really think you are feeling that pain.