Sleep and Health
Even though the relation of sleep and health is relative, it can be traced to the question of function of sleep. The multiple functions and theories proposed to explain the fiction of sleep reflect as-yet incomplete understanding of the subject. A celebrated researcher on the subject, William Dement, founder of the Stanford University's Sleep Center, stated, "as far as I know, the only reason we need to sleep that is really, really solid is because we get sleepy." For example, it's believed in some circles of researchers that sleep evolved to fulfill some primeval function and took on multiple functions over time. The relation between one's sleep and health is closely related to the balance of the sleep-wake time we all have.
A healthy sleep is also heightened anabolic state, regulated by the circadian clock (the body's natural biological clock), accentuating the growth and rejuvenation of the immune, nervous, skeletal and muscular systems. It is observed in all mammals, all birds, and many reptiles, amphibians, and fish. The purpose and mechanisms of the different sleep stages are only partially clear and are the subject of intense research. The sleep cycle is often thought to help conserve energy, but actually decreases metabolism only about 5-10%.
REM Sleep (Rapid eye movement sleep), is a normal stage of sleep characterized by the random movement of the eyes, it is the stage of the sleep cycle that the most vivid dreams happen. The ability to reach it secures a good night sleep, very important to keep a healthy balance.
Common sleep disorders or any condition that disrupts the sleeping cycle or the sleep stages of an individual can result in health issues that could hinder the person's health. For example sleep deprivation, narcolepsy or insomnia (or a similar sleep disorder) can cause an impaired immune system, increased risk of heart disease, hallucinations (on severe cases) and other serious issues. That is why is HEAVILY recommended to have a good sleep and health balance, always.
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