I had a dream where I was in a white room and I couldn't move, but I knew it was a dream. I tried to move my hands and feet but I couldn't until I jerked one of my hands really hard and woke up instantly with my hand actually jerking towards my shelf where it hit it. I heard that sleep paralysis is when you are awake and can't move, but will this be considered sleep paralysis? I had this dream a few times and how do I prevent it?