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why do we need to sleep early

Getting enough sleep used to be one of those things everyone knew was critical (especially young doctors and new parents), but no one could swear what "enough" was, or why. Not anymore. The just-right amount for most of us is 6 to 8 hours a night. Not getting enough doesn't just leave your eyes bleary, your brain fuzzy and your reaction time dull, it also makes you fat. Going to bed earlier does the opposite. Here's why:
People who turn in earlier typically eat about 250 fewer calories per day than night owls. Start tonight and you could lose 24 pounds in a year just by putting on your PJs earlier. A late sleep-wake cycle throws off your body's natural rhythm of sleeping at night and eating in daylight. Doing the reverse -- eating at night, sleeping more during the day -- messes with your meal patterns and metabolism. Ramping up calorie-burning activities during the day is tough if you're always tired from late nights.

Sleep shortages affect blood sugar and insulin levels in ways that make weight gain more likely and shift your hunger hormones into "gimme more" mode. 4. Lower risk of injury. Sleeping enough might actually keep you safer. has been linked with many notorious disasters, like the destruction of the space shuttle Challenger and the grounding of the Exxon Valdez. The Institute of Medicine estimates that one out of five auto accidents in the U. S. results from drowsy driving -- that's about 1 million crashes a year. Of course, any kind of accident is more likely when you're exhausted, says Jodi A. Mindell, PhD, a professor of at St. Joseph's University in Philadelphia and author of Sleep Deprived No More. "When you're overtired, you're more likely to trip, or fall off a ladder, or cut yourself while chopping vegetables," she says. "Household accidents like that can have serious consequences. " 5.

Better mood. Getting enough sleep won't guarantee a sunny disposition. But you have probably noticed that when you're exhausted, you're more likely to be cranky. That's not all. "Not getting enough sleep affects your emotional regulation," says Mindell. "When you're overtired, you're more likely to snap at your boss, or burst into tears, or start laughing uncontrollably. " 6. Better. Getting enough sleep could help you maintain your weight -- and conversely, sleep loss goes along with an increased risk of weight gain. Why? Part of the problem is behavioral. If you're overtired, you might be less likely to have the energy to go for that jog or cook a healthy dinner after work.

The other part is physiological. The hormone plays a key role in making you feel full. When you don't get enough sleep, leptin levels drop. Result: people who are tired are just plain hungrier -- and they seem to crave high-fat and high-calorie foods specifically. 7. Clearer thinking. Have you ever woken up after a bad night's sleep, feeling fuzzy and easily confused, like your can't get out of first gear? "Sleep loss affects how you think," Mindell tells WebMD. "It impairs your cognition, your attention, and your decision-making. " Studies have found that people who are sleep-deprived are substantially worse at solving logic or math problems than when they're well-rested. "They're also more likely to make odd mistakes, like leaving their keys in the fridge by accident," she tells WebMD.

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