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Sleep Nervous System

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Sleep
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Reading Level

	edHelper's suggested reading level:	grades 4 to 6
	Flesch-Kincaid grade level:	4.95

Vocabulary

challenging words:

hypothalamus, maintenance, repeated, sleepwalks, elderly, survival, newborn, body, dreams, automatic, normally, saves, hallucinate, lighter, thoughts, heartbeat

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Sleep By Jennifer Kenny

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¹     Your body needs rest and enough sleep each night. Your body becomes relaxed and inactive. What about your brain? Well, your brain never stops. Its automatic control system keeps your heartbeat, breathing, and other vital processes going. Your sleep center is in the part of your brain called the hypothalamus. Even though we know that your brain doesn't stop, doctors know from EEG that the patterns in your brain are different when you are asleep than when you are awake.
 
²     Scientists know also from EEG and through observing the body's activities while sleeping that there are four main stages of sleep. The cycles last between 60 and 90 minutes each and become shallower throughout the night.
 
³     At first you sleep in a floating, daydreaming state. Then your heartbeat and breathing slow and your body temperature falls during "sleep spindles." In the third state, you are in a very deep sleep, and your brain is a pattern of slow delta waves. A person who sleepwalks, talks in his sleep, or wets the bed normally does it during this stage. Finally, the waves speed up and dreams begin during the R.E.M. stage. R.E.M. stands for rapid eye movements. A person's eyes move and flicker even though the eyelids are closed. A person can often remember his dream if he wakes up during this stage. When the R.E.M. stage is over, sleep deepens again, and the person usually goes through the stages once again. This deep sleep/dreaming sleep is repeated. The first delta sleep is very deep at the beginning of the night but becomes lighter toward morning. Scientists believe people need both types of sleep. During any type of sleep, your senses still work for survival. For example, you can still hear strange noises and smell smoke while you sleep.

Paragraphs 4 to 6:
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Nervous System

Nervous System

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