Assessment of infant sleep: how well do multiple methods compare?

Area of Science:

• Pediatrics
• Sleep Medicine
• Developmental Psychology

Background:

• Infant sleep assessment relies on multiple methods, including videosomnography, actigraphy, and sleep diaries.
• Understanding the concordance and discrepancies between these methods is crucial for accurate infant sleep research.
• Previous research has not comprehensively compared these three common methods in a diverse infant population.

Purpose of the Study:

• To compare sleep variables obtained from videosomnography, actigraphy, and sleep diaries in 3-month-old African American infants.
• To assess correlations and discrepancies for sleep schedule, duration, and fragmentation variables across the three methods.
• To investigate if sleep location or surface influences the agreement between assessment methods.

Main Methods:

• A sample of 90 African American 3-month-old infants participated in a week-long sleep study.
• Sleep variables were collected for one night using videosomnography, actigraphy, and sleep diaries.
• Seven key sleep variables were analyzed: sleep onset time, rise time, sleep period, sleep time, wake time, night wakings, and longest sleep period.

Main Results:

• Correlations were highest for sleep schedule variables and lowest for sleep fragmentation variables across all methods.
• Actigraphy and sleep diaries overestimated sleep duration and underestimated night wakings compared to videosomnography.
• Actigraphy demonstrated low sensitivity in detecting wakefulness compared to videosomnography, with actigraphy and diaries showing higher concordance with each other than with videosomnography.

Conclusions:

• Videosomnography, actigraphy, and sleep diaries exhibit varying levels of agreement for infant sleep assessment, particularly for sleep fragmentation.
• Actigraphy and sleep diaries may not be interchangeable with videosomnography for precise measurement of infant sleep duration and wakefulness.
• Future infant sleep research should carefully consider the limitations and concordance of chosen sleep assessment methods.