Sleepless nights, troubled futures: The association between insufficient sleep and child flourishing.

Objective: To examine associations between sleep and flourishing among children ages 0-5 years in the United States and whether these differ by age, developmental needs, and family resilience.

Study Design And Methods: Cross-sectional data from the 2020-2021 National Survey of Children's Health (N = 31,095) were used with survey-weighted logistic regression to explore associations between insufficient sleep (defined as not meeting age-recommended daily sleep guidelines: 12-16 h for 4- to 12-month-olds, 11-14 h for 1- to 2-year-olds, and 10-13 h for 3- to 5-year-olds) and flourishing (using four markers combined and categorized into two groups). Tests of effect measure modification (EMM) were performed on the multiplicative and additive scales.