When I had surgery on my ankle and was on a bunch of medication for pain I kept having those dreams. It was always the same one though paralyzed, eyes open looking around with my eyes seeing that I was in my room thinking it was real life but I couldn't move and as time went by I felt more and more pressure on my body then out of no where some black cat with red eyes would appear either next to me or on my chest staring at me. Everytime I realized I was dreaming but I would still freak out/panic and do whatever I could do to wake up. I stopped having these once I got off painkillers and since then I refuse to take any medication whatsoever before going to bed.