Rip Van Winkle and Sleeping Beauty

Every morning, when we wake up the kids, we get one smiley child and one grumpy child. Can you guess which is which?


My daughter is all smiles and sweet and my son is all tired and grumpy. (he may take after me in the mornings)

Do you think we are born predisposed to be grumpy or happy in the morning or is there some way to change how people act when they first wake up?