Based on maximum and minimum changes in infant sleep, 20 families (10 intervention families and 10 comparison families) will be invited to participate in evaluative qualitative interviews upon completing the second home visit. Semi-structured family interviews will elicit descriptions about parental experiences that explain the quantitative findings. Interview will be transcribed and transcripts will be analyzed using Thematic Analysis. Preliminary results of the thematic analysis will be submitted to the qualitative participants for review and opportunities for clarification or further explication will be provided.