Apple juice confirmed. Drank two big glasses before bed (damn near made me throw up), and last night I had 2 sorta vivid dreams, but most importantly, both were in 1st person. I also had two little fragments in 1st person. Before, I had a dream in 1st person maybe once a week. Going from that two 4 1st person dreams in one night can only mean one thing- the apple juice makes you dream in 1st person, and increases vividness. I did, once again go to sleep fairly late, about 1am, so that may have hampered my test, but still.
And this is not placebo, as I was skeptical of it at first. But for me now, it's proven.