I regularly experience sleep paralysis, I'll be almost asleep then all of a sudden I become all scared and tense and I lose the complete ability to move, I try screaming or shouting for someone but every time I try it's like i can't get the words out of my mouth, I always tried to fight it but then I realised if you just try and relax it will go away faster

But it can be really difficult to deal with and I have no idea why it happens.