Is it normal that i am having reocuring nightmares

this last week iv been having the same nightmare. im laying in my bed not able to get up, feeling like im being held down by something evil. then when i do get the strenght to get up i still feel like im getting pulled down, while im up i cant see very clearly and always reach for the light strings on the fan and the light dosent turn on and i keep trying cause i think it will make whatever is there go away. then i wake up scared as hell. the dream is sometimes in diffrent rooms but the same thing is happening. and another thing everytime i have the dream it feels like its the first time im having it in the dream. anyone have any idea why im having it or ways to stop them