All parents of 2 to 5 year-olds seen in a family practice for a routine appointment are asked to complete a psychosocial concerns checklist. Parents who have concerns regarding their child's sleep (Trial 1), how to discipline their child (Trial 2), or concerns about both their child's sleep and discipline (Trial 3), and meet the other study criteria, are invited to take part in the study. Mailed baseline assessment packages assess children's behavior, parenting practices and potential predictors of treatment success.