El Sueño

Know About Healthy Body
Benefits of Sleep
Sleep is the natural state of bodily rest. When you sleep, your body rests and restores its energy levels. Consistently good sleep helps you cope with stress, solve problems and recover from illness, and helps ensure long-term physical and mental well-being.
debatable question that how many hours of sleep are sufficient for a normal human being.According to a recent study led by an Indian origin researcher, the best duration for quality sleep per day is seven hours.
The researcher, along with his team at West Virginia University, has established through the study that seven hours of sleep is the appropriate duration to sleep per day for a normal human being and that more or less than that duration can increase the risk of developing acoronary heart disease.
The results of this study have been based upon the analysis of data accumulated in a 2005 study conducted in the U. S. on 30,000 adults. It was discovered that persons who slept for nine hours or more per day were 1.5 times more likely to suffer from a heart disease than the required seven-hour sleepers.
Although scientists are still trying to learn exactly why people needsleep, animal studies show that sleep is necessary for survival. For example, while rats normally live for two to three years, those deprived of REM sleep survive only about 5 weeks on average, and rats deprived of all sleep stages live only about 3 weeks. Sleep-deprived rats also develop abnormally low body temperatures and sores on their tail and paws. The sores may develop because the rats' immunesystems become impaired. Other studies suggest that sleep deprivation affects the immune system in detrimental ways.
Sleep appears necessary for your nervous system to work properly. Too little sleep leaves you drowsy and unable to concentrate the next day. It also leads to impaired memory and physical performance and reduced ability to carry out math calculations. If sleep deprivation continues,hallucinations and mood swings may develop. Some researchers believe sleep gives neurons used while you are awake a chance to shut down and repair themselves. Without sleep, neurons may become so depleted in energy or so polluted with byproducts of normal cellular activities that they begin to malfunction. Sleep also may give the brain a chance to exercise important neuronal connections that mightotherwise deteriorate from lack of activity. One study found that REM sleep affects learning of certain mental skills. People taught a skill and then deprived of non-REM sleep could recall what they had learned after sleeping, while people deprived of REM sleep could not.
Deep sleep also coincides with the release of growth hormone in children and young adults. Many of the body's cells also showincreased production and reduced breakdown of proteins during deep sleep. Since proteins are the building blocks needed for cell growth and for repair of damage from factors like stress and ultraviolet rays, deep sleep may truly be "beauty sleep." Activity in parts of the brain that control emotions, decision-making processes, and social interactions is drastically reduced during deep sleep,suggesting that this type of sleep may help people maintain optimal emotional and social functioning while they are awake. A study in rats also showed that certain nerve-signaling patterns which the rats generated during the day were repeated during deep sleep. This pattern repetition may help encode memories and improve learning.
Your Sleep Physiology
Sleep is the natural state of bodily rest. Whenyou sleep, your body rests and restores its energy levels. Consistently good sleep helps you cope with stress, solve problems and recover from illness, and helps ensure long-term physical and mental well-being.

Circadian rhythms are regular changes in mental and physical characteristics that occur in the course of a day (circadian is Latin for "around a day"). Most circadian rhythms are...