Bedtime routines and objectively assessed sleep in infants.

Aims: To examine the association of the timing and consistency of parent bedtime routines with infant night‐time sleep duration and variability. Design: This was a prospective observational study conducted between November 2012 and November 2016. Methods: Three hundred and twenty healthy 6‐month‐old infants were recruited from the well‐child clinics of a university‐affiliated hospital in northern Taiwan. Participating families provided sociodemographic, health and bedtime routine information. Infants wore an actigraph on the ankle for a week. General linear model analysis was performed with the frequency and timing of bedtime routines treated as the primary predictor variables of interest. Results: One hundred and ninety‐seven (61.6%) parents started the bedtime routine for infants after 9 PM, with 162 (50.6%) not having the exact same bedtime routine every night. In both crude and adjusted analyses, starting a bedtime routine after 9 PM was associated with shorter infant night‐time sleep duration (b = −23.55, p < 0.01). Infants with a bedtime routine of <3–4 nights per week were associated with more variable night‐time sleep duration than a bedtime routine of 5–6 nights per week (b = −7.81, p < 0.05) or every night (b = −8.47, p < 0.05). Conclusion: 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. [ABSTRACT FROM AUTHOR]