Up to 70% of children under age five have sleep problems. Sleep issues are complicated and have many causes. They’re hard to deal with because when children aren’t sleeping, parents aren’t sleeping, and that lack of sleep affects every minute of every day for every person in the family because lack of sleep isn’t just about being tired. Sleep has a role in everything — dawdling, temper tantrums, hyperactivity, growth, health, and even learning to tie his shoes and recite the ABCs. Sleep affects everything.