Since the book is on self-experimentation, couldn’t you see whether you yourself have done worse on DNB/SR flashcards on days after you have some degree of lucid dreaming?
I haven’t worked on lucid dreaming in years, because I was so unsuccessful; I never got beyond improving my dream recall with a dream journal.
I haven’t worked on lucid dreaming in years, because I was so unsuccessful; I never got beyond improving my dream recall with a dream journal.