Get this....in the middle of the night usually about 3 a.m. I am awakened by a loud crack coming from somewhere between our bedroom and the ensuite. I think it happens mainly in winter and hardly misses a night. It cracks loudly and sometimes sounds like there could be someone taking a few steps on the hardwood. It is really kind of freaky especially when I am alone. I have ruled out ghosts so it has occurred to me that maybe some of the hardwood is too close to the wall (hot water heating under floor, pex tubing is up against the underside of floor as it is supposed to be). Geez, every night !! The floor squeaks were taken care of by the humifiers. Am I right?