Really absorbing the material

The past few nights, I dreamed very vivid dreams about anatomy. Interestingly, these dreams have been devoid of any emotion - positive or negative. I would have expected some sort of anxiety to have played out through my subconscious mind. Instead, I moved through anatomical structures, calmly and methodically identifying them. Last night, for instance, after studying the circulatory system, my dreams were filled with arteries and veins and anastomoses. This is either a good indication that I'm really absorbing the material, or an early sign of anatomy-induced insanity.