Sleep parylsis

Anyone that's ever had sleep parylsis is this normal? So I went to bed around 11 and woke up at 6 and I shall sleep thru the whole night. I woke up around 6 and tried to go back to sleep and I kept having sleep parylsis I had it around like 10 times, felt like I was stuck and couldn't move I heard my feet scratching the bed and my hands clentch.. but my sleep parylsis is more like My eyes are still closed and I can't see anything it's all black but I rememebr the dream I was having? Also I feel weak and out of it after I have it? Is there any harm or anything caused by sleep parylsis?