Comedian Bill Cosby says misunderstanding lies at the heart of most marriages.

"If the amusement park called Great Adventure had been created by me, it would have no slides or rides. . . . It would simply have one married couple trying to sustain the glow of their love," Cosby wrote in his new book, "Love and Marriage," excerpted in June's Good Housekeeping.Cosby says philosophers have long debated whether a husband and wife should go to bed angry at each other, but he has found two good reasons for making up at bedtime:

"It feels like the right moment for reconciliation, and a fight is harder to sustain when one of the fighters falls asleep."