When my husband had hip replacement surgery, Kuhio slept beside his incision and purred her brains out. She stayed there for weeks until he was completely healed. (I read somewhere that a cats purr is at the same ?frequency? that they use to promote bone grownth). Anyway, after that she returned to her normal spot. She always prefered to sleep on the pillow with us. No, no one had a brain tumor or anything.... It's just because she was always cold and you lose most body heat through your head. Princess Kuhio was just keeping herself warm.