My first night after surgery was fine, but on night 2 I woke up at 4am bleeding from my scalp. When I looked in the mirror, there was a small, little white "worm" in my hair. I called my surgeon the next day (I had flown home) and he told me it was probably a graft. I think because my scalp was so itchy that I must have scratched it in my sleep and dislodged one. I'm not sure how to prevent this but have a couple suggestions. If your doctor gave you a sedative (e.g. Valium) pre-op, take that or an over-the-counter sleep aid for 3-4 nights after surgery to help you sleep more deeply and reduce chances of nocturnal scratching/rubbing. Another is buy some breathable surgical paper hair "caps" to cover your head at night.