I had put in an 18-hour day at work and was upset to find my four-year-old Zack asleep in bed with my husband when I got home. Zack squirms so much it is impossible to get a decent night's sleep when he is with us. Exhausted, I collapsed into his bed instead, where I slept better than I had in years.

The next morning, I asked my husband, "Why was Zack in bed with you?"

"Oh," he replied, shrugging, "he wet his bed, and I was too tired to change his sheets."