I don't think it's a problem at all--unless you wake up and find you've dug a hole in your mattress!!
Seriously though, we are all dreamers. Even if we hunt newer things--we try to find more of them than last year, or break our personal records, or find greater variety of them--or whatever. The point is, we're still dreaming.
I've researched sites so hard before that I knew every fact, every quote, every reference word-for-word. I've hunted areas an hour's drive away from where I live so intensely that I knew every person's first, last, and sometimes MIDDLE name and their relation to every other person there. I've hunted on land where it didn't matter if I crossed a fence or two, since I had permission from all of the property owners surrounding where I was hunting for a solid square mile.
I've had dreams about Real sites--and that is creepy. When I devoted a year of my life to finding an undiscovered Civil War camp in Virginia as a teenager, I would have recurring dreams about finding the site--literally walking into it slowly and digging a bullet here or there on the fringe of the site--then suddenly wallking into the thick of it and digging two or three dropped bullets and buttons per sweep.
To say that dreaming is bad--or a sign of a problem--is a negation of one of the Big motivators in our hobby.
We dream of The Finds. We dream of The Adventure. Then we go out and recover things that are so odd, so unusual, so unique that we could've never even begun to dream that such items were lost underground in the first place.
We even log into TreasureNet so that we can Daydream about what others are finding.
My advice is to hold fast to it, and enjoy it--whether Awake or Asleep. Work hard enough and it Will come true. Detectorists who never
dream will never make the types of finds that
others dream of.
-Buckleboy