Frozen in bed nearly everynight?

This happens id say 5 out of the 7 days in the week. Ill be just falling to sleep go to sleep without knowing it day dreaming about something then find that its out of place like me staring at the ceiling but something is "off" the im frozen here a loud yelling noice and lurch out of bed in a cold sweat sometimes screaming sometimes just frozen for a second. Does anyone know whats going on is this night terrors nightmares why is it happeneing so often? Im kind of scared or just would liek to get to the bottom of it?