Bedtime routines and objectively assessed sleep in infants.

A bedtime routine of at least 5 nights a week and initiated no later than 9 PM was associated with longer and less variable night-time sleep in infancy. Findings suggest that a consistent bedtime routine implemented in accordance with age-appropriate bedtimes should be addressed as part of anticipatory guidance in the well-child clinics. Future studies should include infant sleep variability as an outcome in addition to the conventional mean-level sleep variable analyses to more thoroughly characterize bedtime routine effects.