What is sleep paralysis in Buddhism view?

Sleep paralysis is a condition which occurs up to as many as 4 out of every 10 people according to some statistics. Sleep paralysis happens when one is about to fall asleep or while waking up during the transitional states between wakefulness and sleep. In the course of sleep paralysis one will experience temporary paralysis that makes it unable to move or speak. The paralysis may last usually only few minutes. In addition the individual might also perceive terrifying hallucinations that are made worse with the inability to move or speak.