. 2021 Sep 24;70(38):1315–1321. doi: 10.15585/mmwr.mm7038a1

TABLE 1. Prevalence of short sleep duration* and regular bedtime^† among persons aged 4 months–17 years, by age group — National Survey of Children’s Health, United States, 2016–2018.

Characteristic	% (95% CI)^§
Characteristic	All persons aged 4 mos–17 yrs (n = 99,842)	Infants aged 4–11 mos (n = 2,499)	Children aged 1–2 yrs (n = 10,147)	Children aged 3–5 yrs (n = 15,290)	Children aged 6–12 yrs (n = 36,179)	Adolescents aged 13–17 yrs (n = 35,727)
Short sleep duration	34.9 (34.2–35.6)	40.3 (35.9–44.7)	33.3 (31.2–35.4)	34.8 (33.1–36.7)	37.4 (36.3–38.6)	31.2 (30.1–32.4)
Regular bedtime	33.9 (33.2–34.6)	43.5 (39.1–47.9)	40.9 (38.7–43.0)	37.3 (35.5–39.1)	37.0 (35.9–38.2)	23.8 (22.7–24.9)

Abbreviation: CI = confidence interval.

* Short sleep duration is defined as <12 hours for infants aged 4–11 months, <11 hours for children aged 1–2 years, <10 hours for children aged 3–5 years, <9 hours for children aged 6–12 years, and <8 hours for adolescents aged 13–17 years.

^† Regular bedtime is defined as a response of “always” to the question about how often the person aged <18 years goes to bed at approximately the same time on weeknights.

^§ Weighted percentages. The National Survey of Children’s Health is weighted to be representative of the U.S. population of noninstitutionalized persons aged ≤17 years. https://www2.census.gov/programs-surveys/nsch/technical-documentation/methodology/NSCH-Guide-to-Multi-Year-Estimates.pdf

TABLE 1. Prevalence of short sleep duration* and regular bedtime† among persons aged 4 months–17 years, by age group — National Survey of Children’s Health, United States, 2016–2018.

TABLE 1. Prevalence of short sleep duration* and regular bedtime^† among persons aged 4 months–17 years, by age group — National Survey of Children’s Health, United States, 2016–2018.