A recent study showed that children who sleep less may be more likely to report symptoms of anxiety, depression and aggression later in life. Sleep problems are risk indicators of later emotional difficulties in childhood and adolescence and in adulthood," according to background information in the article written by Dr Alice Gregory, PhD of the University of London which appeared in the Journal of Pediatric Adolescense Medicine. The results of the study suggest that children who sleep for short periods may be at risk for later difficulties. Dr Gregory recommends that "Physicians should inquire about sleep problems during child development and should be aware that some, but perhaps not others, may constitute risk indicators of later difficulties."
Source: http://pubs.ama-assn.org/media