It can be easy to assume that your child isn't tired enough for their second nap anymore by they way they look, but Spivak warns parents it's not a foolproof method. "Your child might not look as tired anymore from at least two hours after they wake in the morning . . . which can make parents believe that their child is not tired enough for a second nap," Spivack said. "This is usually a misunderstanding, and not truly a sign they should drop to just one nap per day."