Wordserve Water Cooler has 10 Kooky Tips On How To Write A Book. Among them:
2) If you have kids, get a lock for your bedroom door
My reasoning is two-fold: 1) my bedroom is where I write, and 2) my bedroom is where I cry when I am convinced that I cannot write, and it seems to upset the children when I cry uncontrollably.
Make sure to check out the rest.