When we put our house up for sale, I stressed emphatically that my sons make their beds each morning. I left for work before they left for school, and I wanted to be sure that the house looked presentable when the agent showed it to prospective buyers.

I was surprised and impressed that my 15-year-old son's bed was perfectly made each day. One night when I went into his room, I discovered his secret.

He was fast asleep on the floor in his sleeping bag.