Do you ever feel exhausted and drowsy, like you need more sleep? If you do, you're not alone. A recent study by the National Sleep Foundation (NSF) found that 60 percent of people under the age of eighteen complained of daytime tiredness. Fifteen percent (one out of every seven) said they were so tired they fell asleep in school. You may think that not getting sufficient sleep is no big deal, but think again. According to the National Sleep Foundation,...