Reference centiles for infant sleep parameters from 4 to 16 weeks of age: findings from an Irish cohort

Area of Science:

• Pediatric Sleep Medicine
• Developmental Pediatrics
• Biostatistics

Background:

• Establishing normative sleep data is crucial for assessing infant development.
• Existing sleep data for early infancy (4-16 weeks) lacks comprehensive reference centiles.
• Understanding typical sleep trajectories aids in identifying potential developmental concerns.

Purpose of the Study:

• To establish unconditional reference centiles for key infant sleep parameters.
• To provide normative data for total, daytime, nighttime, and longest sleep durations.
• To analyze sleep parameter changes between 4 and 16 weeks of age.

Main Methods:

• Secondary analysis of data from a longitudinal randomized controlled trial (BabySMART).
• Inclusion of healthy, term infants from the non-intervention arm.
• Sleep diaries recorded daily sleep duration from 2-16 weeks; multilevel modeling used for centile estimation.

Main Results:

• Data from 106 infants provided 1264 sleep measurements.
• Total sleep duration and longest sleep episode duration increased between 4-16 weeks.
• Nighttime sleep duration (12-hour period) increased, while daytime sleep duration (12-hour period) decreased.

Conclusions:

• Established reference centiles reveal a decrease in daytime sleep and increase in nighttime sleep up to 4 months.
• Sleep episode duration lengthens in tandem with these changes.
• These centiles offer valuable benchmarks for infant sleep trajectories, assisting parents and clinicians.