Music in Head and Dreams

I woke up this morning to a Bon Iver track playing in my head, “Blindsided” I was brushing my teeth and right away I knew the lyrics by heart. I sang to myself, and I heard the actual song in my head for a long time. I was really tired, and I kept making myself fall asleep. This occurs a lot to me with different songs and it’s interesting, I’d really like to know why it happens. If I were to guess, I’d say the lyrics really get embedded in your head and it connects with the dreams. The dreams connect with life, and present obstacles in an abstract formation where you work to fix the errors. Just my opinion though…