lack of sleep

http://www.cnn.com/HEALTH/9703/17/nfm/sleep.deprivation/index.html

Anyone that works more than one job, goes to college, or lives paycheck to paycheck knows what lack of sleep is. Most of America falls under these categories. Lack of sleep is a problem because your less attentive tothe things around you. While driving people could be falling asleep at the wheel. People wonder why starbucks' make so much money? It's because were caffeine addicts because we have no sleep.