 Research Design: The study is a randomized controlled trial aimed at 6 to 8-month-old infants who are waking at night and crying, with stratification by community health centres and blinded analysis of actigraphicsleep diary data Primary Question: In a population of parents who have infants with behavioural sleep problems are parents randomized to a cognitive-behavioural sleep intervention compared to parents randomized to a group cognitive-behavioural safety intervention more or less likely to: a identify their child as having a severe sleep problem, or b to have their child wake fewer than an average of 2 times per night over 5 nights by actigraphy? Inclusion criteria: Biological or adoptive parents who: 1 read and speak English, 2 have access to a telephone, and 3 are in two parent or single parent families. Infants who are: 1 healthy, 2 between 5.5 and 8 months of age, and 3 screened and identified as having a sleep problem. 