Sleep and discipline problems are the most common problems for parents of young children (ages 2 to 5 years old) and are the two concerns with the strongest relations to future child behavior problems. The Parenting Matters program combines treatment booklets and telephone support to help parents deal with sleep or discipline problems. Parents with concerns and who are interested in the study are identified during a visit to their family physician. We, the investigators at the University of Western Ontario, expect that parents receiving treatment booklets, along with usual care by their family physician, will have greater reductions in their child's sleep or discipline problems, improved parenting practices, and greater reductions in child behaviour problems after receiving the Parenting Matters intervention, compared to parents receiving usual medical care.