1 Causes of heat exhaustion include activity in a hot environment that can overwhelm the body's ability to cool itself, causing heat-related symptoms, and living in a hot environment without adequate access to water for dehydration. 2  Signs and symptoms of heat exhaustion include. 3  profuse sweating,  weakness,
The average amount of sleep that teenagers get is between 7 and 7 Â¼ hours. However, they need between 9 and 9 Â½ hours (studies show that most teenagers need exactly 9 Â¼ hours of sleep). Teenagers do not get enough sleep for a number of reasons:
For older teens, seven hours a night was plenty. The optimal amount of sleep for 12-year-olds was higher, about eight hours, while 10-year-olds did best with about nine hours. The report appears in the current issue of the Eastern Economics Journal.