Reduce Depression

Steer clear of depression Sleeping well means more to our overall well-being than simply avoiding irritability. "A lack of sleep can contribute to depression," Dr. Jean says. "A good night’s sleep can really help a moody person decrease their anxiety. You get more emotional stability with good sleep." If you think the long hours put in during the week are the cause of your anxiety or impatience, Dr. Rapoport warns that sleep cannot necessarily be made up during the weekend. "If you sleep more on the weekends, you simply aren’t sleeping enough in the week," he says. "It’s all about finding a balance.

Avoid Accidents

Avoid accidents The National Highway Traffic Safety Administration reported in 2009 that being tired accounted for the highest number of fatal single-car run-off-the-road crashes due to the driver’s performance—even more than alcohol! "Sleepiness is grossly underrated as a problem by most people, but the cost to society is enormous," Dr. Rapoport says. "Sleeplessness affects reaction time and decision making." Insufficient sleep for just one night can be as detrimental to your driving ability as having an alcoholic drink.

Lower Stress

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."

Healthy Weight

Have a healthy weight If you are thinking about going on a diet, you might want to plan an earlier bedtime too. Researchers at the University of Chicago found that dieters who were well rested lost more fat—56% of their weight loss—than those who were sleep deprived, who lost more muscle mass. (They shed similar amounts of total weight regardless of sleep.) Dieters in the study also felt more hungry when they got less sleep. "Sleep and metabolism are controlled by the same sectors of the brain," Dr. Rapoport says. "When you are sleepy, certain hormones go up in your blood, and those same hormones drive appetite."

Sharpen Attention

Sharpen attention A lack of sleep can result in ADHD-like symptoms in kids, Dr. Rapoport says. "Kids don’t react the same way to sleep deprivation as adults do," he adds. "Whereas adults get sleepy, kids tend to get hyperactive." A 2009 study in the journal Pediatrics found that children ages seven and eight who got less than about eight hours of sleep a night were more likely to be hyperactive, inattentive, and impulsive. "We diagnose and measure sleep by measuring electrical changes in the brain," Dr. Rapoport says. "So not surprisingly how we sleep affects the brain."

Improve Grades

Improve your grades Children between the ages of 10 and 16 who have sleep disordered breathing, which includes snoring, sleep apnea, and other types of interrupted breathing during sleep, are more likely to have problems with attention and learning, according to a 2010 study in the journal Sleep. This could lead to "significant functional impairment at school," the study authors wrote. In another study, college students who didn’t get enough sleep had worse grades than those who did. "If you’re trying to meet a deadline, you’re willing to sacrifice sleep," Dr. Rapoport says, "but it’s severe and reoccurring sleep deprivation that clearly impairs learning."

Win

Be a winner If you’re an athlete, there may be one simple way to improve your performance: sleep. A Stanford University study found that college football players who tried to sleep at least 10 hours a night for seven to eight weeks improved their average sprint time and had less daytime fatigue and more stamina. The results of this study reflect previous findings seen in tennis players and swimmers.