Sleep
Does anybody ever come home from a long day of work or a hard day at school and only one thing is on your mind. It is probably the greatest feeling on earth, well at least one of the greatest feelings on earth. What am I talking about? I am talking about sleep. Since the beginning of time history is filled with people fascinated with sleep. Does anybody ever think about why we sleep or what goes on to our brains while we sleep? Well before the twentieth century sleep was thought of as just a period of restful inactivity because there was no clear way to study brain activity. But since then the invention of the electroencephalograph by German psychiatrist Hans Berger in the 1920s it gave sleep researchers a tool for studying brain activity. These brain activities that they study are called brain waves. Today's scientist research a number of physical functions during sleep such as eye movements, muscle movements, breathing rate, air flow, pulse, blood pressure, amount of exhaled carbon dioxide, body temperature, and breathing sounds. There are two basic types of sleep. REM sleep also known as rapid eye movement sleep or active sleep, and NREM sleep, or non rapid eye movement sleep, also known as quiet sleep witch is divided into fou
Four months before birth REM sleep is basically all the fetus does. I will also describe the changes in sleep over our lifespan. REM sleep begins long before birth scientists have discovered by using ultrasound. When people are briefly awakened by sleep researchers during stage 4 and asked to do a simple task they often do not remember it the next day. Stage 1 NREMIn this stage the alpha brain waves caused by drowsiness are replaced by even slower brain waves called theta brain waves. REM SleepDuring REM sleep the brain becomes more active producing smaller and faster brain waves. When that total exceeds 50 percent the sleeper is in stage 4. After the first cycleThroughout the rest of the night the sleeper cycles between NREM and REM sleep. The most common of these hallucinations is the sensation of falling.
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