I would go with psychological fallout and/or reduce how much St. John's Wort I'm taking if it doesn't seem to be helping, maybe even taper it off and see?

When I had a lot going on in therapy I would have more active dreams and did the song thing too, where I'd wake in the night with a particular song going around for a couple weeks in a row (it was a song significant to what was being discussed in therapy and when I noted and "looked at" that fully, I didn't need it to do that anymore).