Hi angd,
You would think that after 25 days it wouldn't be a physical symptom of withdrawal, but I might be quite wrong about that. Other than a possible reaction to meds or supplements you may be taking, the nightmares could be purely symbolic of something you are struggling with at the moment. Alcohol is one obvious possibility, but only you could interpret them. Not very pleasant for you at all though. I hope you manage to get a good sleep. Sleep deprivation is awful. Sleepy time tea with honey sounds a good trick :-)