1-Lower stress
When it comes to our health stress and sleep are nearly one and the same—and both can affect cardiovascular health.Sleep can definitely reduce levels of stress, and with that people can have better control of their blood pressure," Dr. Jean says. "It’s also believed that sleep effects cholesterol levels, which plays a significant role in heart disease.
2-Improve memory
Your mind is surprisingly busy while you snooze. During sleep you can strengthen memories or "practice" skills learned while you were awake (it’s a process called consolidation).
3-Live longer.... 
Too much or too little sleep is associated with a shorter lifespan—although it’s not clear if it’s a cause or effect. (Illnesses may affect sleep patterns too.)In a 2010 study of women ages 50 to 79, more deaths occurred in women who got less than five hours or more than six and a half hours of sleep per night.
4-Sleep also affects quality of life. 
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"Many things that we take for granted are affected by MD, director of sleep medicine and associate director of critical care at St. Luke’s-Roosevelt Hospital Center in New York City. "If you sleep better, you can certainly live better. It’s pretty clear
