Napping may have a significant influence on young children's daytime functioning, according to a research abstract presented on Monday, June 8 at SLEEP 2009, the 23rd Annual Meeting of the Associated Professional Sleep Societies. Results indicate that children between the ages of 4 and 5 who did not take daytime naps were reported by their parents to exhibit higher levels of hyperactivity, anxiety and depression than children who continued to nap at this age.