Is sleep that important??

This is a science fact..

Most people would agree that there's nothing better than a good night's sleep. Stressful day at the office? Long hours doing yard work and housework? All this can repaired with a nice, long slumber. There have been thousands of sleep studies performed over the years, but we still aren't exactly sure why we sleep. Prior to 1915, scientists thought bedtime was merely shutdown mode for both the body and mind. It wasn't until a graduate student at the University of Chicago hooked his son to a brain wave machine during sleep that we learned about rapid eye movement (REM) - sleep period when the brain speeds up its activity. During REM sleep our eyes twitch, our limbs and facial muscle may move and we dream. One sleep theory is that our brain goes over the information it received that day and decides what should stick around and where it should go. Behavioral research supports this notion, but sleep is so mysterious and different for each person that it's tough to get conclusive results. Event though we aren't exactly sure why we sleep, we know that we have to - all mammals sleep. In fact, a lab rat that would normally live for three years will die in about three weeks without sleep.