I've had those dreams several times. It's like you are paralyzed with the feeling of something is in the shadows of your room but you can’t yell for some reason. I lucid dream a lot which sucks because I have had dreams I’ve died many times. One dream I was stabbed to death and I could feel it, I laid their helpless and slowly dying. Another dream I was shot, my soul left my body and I was watching myself slowly die in an ally way. Most of my dreams feel completely real as if I am actually there. I’ve felt like I was fighting wars on other planets against aliens, etc.
One time during a paralysis type dream, I was looking around my room frozen in my bed. The ceiling became a huge window. I was looking up out a window that looked down on a city (if that makes sense). Then I felt this jolt in my chest and a bright white tunnel appeared. Each time I felt the jolt it got clearer, after like the 4th time I was able to see something. It was a vision through my eyes in another universe, I must have collapsed in a coffee shop and paramedics where trying to revive me. Softly after I woke up completely freaked out.
I have woken up with half my body asleep. One weird time I woke up to go to the bathroom and half my head was asleep which threw off my Equilibrium so I ended up running into everything on the way. What magnifies my lucid dreams are Advil PM’s, NyQuil, or Alcohol, makes it feel like an eternity in the dream but I still wake up feeling exhausted.