It was said that maybe if time permitted there could be some creepy flavor night spawns or something, but the mine was not created to be a "Haunted Mine" or anything...rather, it was a mine full of ogres, which had a haunted story attached to explain the no-rest thing.
![Tongue :P](https://forums.layonara.com/Smileys/default/tongue.gif)
So I would of it as a minor haunting, that endangers one when one sleeps with his guard down or something. Stealing into your dreams, who knows.
The ogres were there because ogres are a good standard set of creatures, I imagine, and the gnolls are there because they took over the place in a DM quest.
![Smiley :)](https://forums.layonara.com/Smileys/default/smiley.gif)
But yeah! It might be fun to take the kind of thin attempt at an explanation and add some touches here and there. Just enough so that it can explain the no-rest, if it is kept.