This was a good collection.
My favorite story out of this anthology was the title story "A Prisoner of Dreamland". I think that it touched closest to one of Lovecraft's Dream Cycle stories the most, and I commend the author for that.
Follow-up favorites include:
•"Of Consciousness and Chaos" (Don't take drugs from friendly strangers...)
•"The Palimpsest" (Don't trust creepy oneiromancers...)
•"The Hungry Stars" (Stay away from Carcosa)
Most of the other stories were good as well, though I didn't particularly care for either "The Witness" or "A Cure for Insomnia".
Overall, it was a great collection, though I would have enjoyed more stories set directly in Dreamland. Can't have everything I guess.
I'd recommend the anthology.