Alright, so you know when your in the castle, and you get to the force field like barrier, and the priest says "We can go to the library, I have the key".

So then you have to walk back up the spiral stair case, and you reach a wooden door that can only be opened by the priest with the key.

Well, he doesn't do anything. He will do one of two things

1) He will just stand where he was, not moving at all. I tried waiting, and I tried going back a save, nothing works.

2) Another thing he will do is he will start to walk up the stairs until he gets stuck somehow on the stairs.

The first time this happened. I tried this. When he got stuck, I FUS RO DA'd him anywhere, but with no success, he stayed still

Now the second time he got stuck walking up the stairs, I FUS RO DA'd him upwards toward the door..IT WORKED! He unlocked the door and I almost was about to finish it, until..I got killed by an Orc. And I forgot to save

Sadly, I got put back to the WAY beginning where the first bug occurred. Except this time, he wouldn't move at all, even if I tried to move him towards the door. I tried this strategy multiple times with no success.

I can't complete the quest help! THis is very frustrating.

He got stuck on the stairs for me to, he started walking and abruptly stopped half way up. I had to use FUS RO DAH to push him up the stairs toward the door. Once I used the shout he opened the door and the quest continued with no further problems.

That's what I did but I died and had to start over...and now he didn't even get stuck half way up the stairs. He is stuck where he was at the bottom.

http://www.gamesas.com/topic/1351316-waking-nightmare-bug/page__fromsearch__1

if you try a search in the forum, you may find the workaround.