FIGURE 5.2
Good Night, Moon Average sleep per 24-hour period is given in percentiles because there is much variation in how many hours a young child normally sleeps. Other charts from this study show nighttime sleep and daytime napping. Most 1-year-olds sleep about 10 hours a night, with about 2 hours of napping, but some sleep much less. By age 3, about 10 percent have given up naps altogether. Note that these data are drawn from reports by U.S. parents, based on an Internet questionnaire. Actual sleep monitors or reports by a more diverse group of parents would show even more variation.