For several years now I've had the sensation that water is dripping from the ceiling onto my legs and arms. It is always cold and I'm always shocked when I automatically touch the spot and it's dry as a bone. Even though I can't confirm the water dropped on my body with my fingers and eyes, it feels like the ceiling is leaking and I have to move just to give myself a bit of a psychological break. It's profoundly disturbing that I can't trust my own body/skin sensations, but otherwise so far just an annoyance. What causes this? I'm 53.