O.k. seriously...is this normal?

I woke up 3 times last night...3 times with 3 different bad dreams....I mean one was so bad and vivid that I thought about it all day today and can't get it out of my mind.  It was truely scary and gruesome....I don't watch scary movies or anything like that and I don't have any bad thoughts ever like these dreams but seriously...I'm scared to go to sleep...is this normal in pregnancy?  I forget it's been awhile...