How did you feel when you woke up today? Did you get up slowly, felt refreshed and had enough time to eat breakfast and plan your day? Or did you throw your alarm against the wall, curse at everything in your path until you felt alive enough to make a cup of coffee? If you are like the 1 in 5 Americans that get less than 6 hours of sleep, you might have trouble remembering simple things, be ill-prepared to deal with everyday stressors and be on edge - leading to unnecessary arguments with friends and family. Although the exact function of sleep is still unknown, lack thereof has been studied extensively. The results are striking - memory encoding problems, emotional disturbances and trouble adjusting to stressful situations are all linked to sleep deprivation. So what happens to us when we don't sleep?