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
Stage 3 and 4 are both very similar. Both stages are defined by the amount of delta brain wave activity. When the delta brain waves represent more than 20 percent of brain activity the sleeper is said to be in stage 3. When that total exceeds 50 percent the sleeper is in stage 4. During the 20 to 40 minutes spent in the night's first episode of stage 4, the delta waves eventually come to represent 100 percent of brain activity. At this point, the sleeper's heart rate, blood pressure, and breathing rates are at its lowest levels. The sleeper in stage 4 is virtually oblivious to the world; noises and other things often fail to wake the sleeper. In this stage the sleeper's muscles are still capable of movement. EX....SLEEPWALKERS. Researchers say its even possible to answer a phone, carry on a conversation, and hang up without remembering it the next day. 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. So up until now, the sleeper is about 70 minutes into a typical nights sleep and in a deep sleep. At this point, the patterns of sleep reverse going from stage 4 to 3 to 2 and enter a new stage of sleep in a matter of minutes called REM sleep. Over the course of the night your sleep patterns are pretty consistent throughout the night. As you go into NREM sleep you go through four different stages. Each stage you go through is characterized by a decrease in brain and body activity. Throughout the rest of the night the sleeper cycles between NREM and REM sleep. Each cycle last about hour and a half all the way up to 2 hours. Usually we go through about 4 cycles throughout the night. Just before and after REM periods are when the sleeper shifts position
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Approximate Word count = 1182
Approximate Pages = 5 (250 words per page double spaced)
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