![A University of Georgia Cooperative Extension expert says children who don't get enough sleep can be irritable and lack concentration. On average, school-aged children need about 12 hours of sleep.](https://secure.caes.uga.edu/news/multimedia/images/4435/SleepyLR.jpg)
Sleep Tight, Learn Better
Almost any teacher in America can look at her class and know which kids went to bed too late the night before. Sometimes the students are grumpy. Sometimes they’re drowsy. Sometimes they’re just not as attentive as they usually are. The symptoms are varied, but they’re all caused by a lack of sleep.