Was It Only A Dream

Young Goodman Brown is a tale where a man leaves society to come back with greater understanding and knowledge. He learns that people who he thought were pure are actually "friends" with the devil. Coming back from the woods, he doesn't even look at his wife the same. It seems like this story was all a dream but don't realities occur in dreams? So both reality and a dream. Or was he hallucinating? His body had enough without faith, he started hallucinating to gain back his knowledge.