However, few of these studies have assessed sleep time using objective measures, 10 and fewer have evaluated the association longitudinally from childhood to adolescence. 9 Reported high levels of television viewing elevated the risk children who slept less and who viewed в‰Ґ 2 h of television per day had a 17% higher chance of becoming overweight compared with those who viewed television fewer hours. For example, in a cohort of 915 infants and toddlers, parents were asked to rate their children's sleep those who slept < 12 h/day were 2.04 times more likely to become overweight by age 3 than children who slept longer. 4 вЂ“ 8 Most of these studies have utilized subjective measures of sleep to determine sleep time. 3 Moreover, recent epidemiological studies have pointed to a strong relationship between short sleep duration and higher body mass index in children. 2 Along with the increasing obesity epidemic, the number of hours that children and adolescents spend sleeping at night has been shown to be decreasing. 1 Among children and adolescents 2вЂ“19 years, 31.7% are at or above the 85 th percentile of BMI for age. The prevalence of being overweight and obese among adolescents and young adults has increased radically during the last 30 years. These relationships did not differ between Hispanic and Caucasian children. A mean increase in BMI of 1.7 kg/m 2 (P = 0.01) over the 5 years of follow-up was seen for children who slept в‰¤ 7.5 h/night compared to those who slept в‰Ґ 9 h/night. Borderline significance for overweight/obese (OR = 2.2, P < 0.1), anxious or depressed (OR = 3.3, P < 0.1), and having learning problems (OR = 11.1, P < 0.1) were seen for children who slept в‰¤ 7.5 h/night as compared to those who slept в‰Ґ 9 h/night. Children who slept в‰¤ 7.5 h/night had higher odds of being obese (OR = 3.3, P < 0.05) at follow-up than children who slept в‰Ґ 9 h/night. Odds of overweight/obese (в‰Ґ 85 th BMI percentile), obese (в‰Ґ 95 th BMI percentile), anxious or depressed, and learning problems at follow-up were assessed according to baseline sleep categories. Children were classified according to baseline sleep as those who slept в‰Ґ 9 h/night, those who slept > 7.5 to < 9 h/night, and those who slept в‰¤ 7.5 h/night.

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