The kind of wave that has compressions and rarefactions is a/an wave

The kind of wave that has compressions and rarefactions is a longitudinal wave.

A longitudinal wave is a wave that moves in the direction of wave particles, it moves based on the direction and motion also referred to as propagation.  This can cause refractions and compressions.

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.