Getting your kids to sleep through the night is crucial for livable parenting. If you want better than livable, you’ll mandate regular naps until your kids are old enough to quietly entertain themselves for an hour. I don’t know how bad it is for toddlers not to nap. Many seem fine either way. What I do know is that if they don’t, it is bad for parents. Nap time gives parents of young children quiet time to catch up on their work, relax, or take a nap of their own.