Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor. Sleep.

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Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor. Sleep and Dreams The sleep cycle is made up of four stages of sleep and REM sleep. Sleep serves important physical and psychological needs. Common sleep problems include insomnia, nightmares, night terrors, sleepwalking, sleep apnea, and narcolepsy. The Importance of Sleep

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor. Reading Focus What is the sleep cycle? How have psychologists explored the importance of sleep and dreams? What are sleep problems? Main Idea Sleeping and dreaming are essential to human health, although many questions remain. Some people are troubled by various sleep problems. Sleep and Dreams

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor. Much of how people, animals, and plants function is governed by circadian rhythms, or biological clocks. Circadian rhythms in humans include a sequence of bodily changes that occurs every 24 hours. The most studied circadian rhythm is the sleep-wake cycle. Sleep stages are described in terms of brain-wave patterns. There are five stages of sleep. Stage 1 is the lightest stage of sleep. Stage 4 is the stage of deepest sleep. The Stages of Sleep The Sleep Cycle After about 30 minutes of stage 4 sleep, we return to stage 3, then stage 2, and then stage 1 sleep. This takes about 90 minutes. Then another stage of sleep begins. It is called rapid-eye-movement sleep, or REM sleep. Beneath the closed lids, the eyes move rapidly. REM Sleep

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor.

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor. People need sleep to revive the tired body and build up resistance to infection. Sleep may help people recover from stress and consolidate memories. REM sleep seems to help animals and people learn, remember, and retain information. REM sleep is when we have the most vivid dreams. People dream in color and in black and white. People seem to dream in “real time.” People do not always remember their dreams. Dreams The Importance of Sleep and Dreams Sigmund Freud theorized that dreams reflect a person’s unconscious wishes and urges. He also believed people dream in symbols as a way to deal with painful material they cannot otherwise deal with consciously. The Freudian View

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor. The Biopsychological Approach Some psychologists believe that dreams begin with biological, not psychological, activity. –According to this view, neurons fire during sleep. The neurons fire in the part of the brain that controls movement and vision. The brain tries to make sense of them by dreaming.

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor. Insomnia Insomnia is the inability to sleep. The most common type of insomnia is difficulty in falling asleep. Many psychologists believe that the best ways to overcome insomnia do not involve medication. They recommend using relaxation techniques, establishing regular bedtimes, and using pleasant images to relax. Nightmares and Night Terrors Nightmares are a product of REM sleep. People who are anxious or depressed are more likely to have nightmares. Night terrors are similar to nightmares but they are more severe. Night terrors tend to occur during deep sleep. Sleep Problems

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor. Sleepwalking Many children walk in their sleep. Most children outgrow sleepwalking as they mature. Sleep Apnea Sleep apnea is a breathing interruption that occurs during sleep. About 10 million Americans have sleep apnea. Narcolepsy Narcolepsy is a rare sleep problem in which people suddenly fall asleep, no matter what time it is or where they are. It is believed to be a genetic disorder of REM-sleep functioning.

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor.

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor. Sleep Deprivation in Teens Lack of sleep affects both the mind and the body. Sleep deprivation can produce mental states of fatigue, drowsiness, and irritability. In addition, lack of sleep can contribute to physical symptoms such as weight gain, heart disease, and other symptoms and ailments. Teenagers who do not get enough sleep can also develop these problems. Current Research in Psychology Studies show a link between lack of sleep and increased rates of obesity, diabetes, heart disease, high blood pressure, and stroke. Teenagers need 9.2 hours of sleep a night. Many high school students get less than 9.2 hours of sleep a night. Lack of adequate sleep puts teenagers at risk for weight gain, poor school performance, car accidents, alcohol abuse, and drug abuse. Starting school later might be one possible solution to insufficient sleep by teenagers.

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor.

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor.

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor.

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor.

Consciousness Original Content Copyright by HOLT McDougal. Additions and changes to the original content are the responsibility of the instructor.