Sleep paralysis and deep REM sleep.?

During Sleep paralysis are you aware of the noise in the real world? Have you ever been stuck in sleep paralysis and dream you've woken up only to realize you were actually still asleep? During REM sleep (dreaming) are you aware of noise in reality? In my dreams sound gets transferred into visual stimuli, but it happens instantaneously. I am acutely aware of sound in reality even in dreams. So how is it that sound can transfer to visual stimuli instantaneously? I hear a bang and I visual related stimuli, but in a cause and effect or linear progression events. Like a pot falls to the floor and makes the bang in my dreams. The pot starts falling before the bang, I hear the bang in reality and it corresponds to the visualization in my dreams. Do you understand? Please give me your interpretation or explanation or experiences.