Kids lie early, often, and for all sorts of reasons—to avoid punishment, to bond with friends, to gain a sense of control. But now there’s a singular theory for one way this habit develops: They are just copying their parents.

Overstimulated, overscheduled kids are getting at least an hour’s less sleep than they need, a deficiency that, new research reveals, has the power to set their cognitive abilities back years.

The inverse power of praise.