Q: If I study a lot in the evening and I continue to think about Kabbalah in my sleep, is that part of the spiritual work and progress, too?
A: What you describe is not a spiritual phenomenon, but a psychological one. The same thing will happen with any text you delve into before you go to sleep. Nonetheless, the fact that you study before you go to sleep and continue to feel the text during sleep is very beneficial. We usually study Kabbalah (the structure of the worlds, the Sefirot, phases, light, vessels) between 3:00 AM and 6:00 AM before we go to work in the morning. I recommend that you learn that material one hour in the morning and read the letters and articles “for fun” in the evening.