section 14.4 sleep and feeling fit slide 1 of 14 objectives describe why sleep is important for...

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Section 14.4 Sleep and Feeling Fit

Objectives

Describe why sleep is important for health.

Explain how circadian rhythms influence the sleep patterns of teens.


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Health Stats What trend does this graph reveal about teens and sleep?

What factors do you think contribute to the sleeping habits of teens?

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• During sleep, your muscles relax, your breathing and heart rate decrease, and your body temperature drops slightly.

What Is Sleep?

• Although some people think of sleep as wasted time, it is actually just as important to the body as air, water, and food.

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• Your brain sorts the day’s information. Learning and the storage of memories may occur.

Benefits of Sleep

• The healing of body tissues occurs during sleep.

• Adequate sleep helps the immune system to function properly.

• Adequate sleep may help prevent some diseases.

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• First, you enter non-rapid eye movement sleep (NREM).

The Sleep Cycle

• As you pass through the four stages of NREM sleep, your body gradually reaches a state of deep relaxation.

• After the stages of NREM sleep, you enter rapid eye movement sleep (REM).

• During REM sleep, your eyes flicker rapidly behind closed eyelids, and there is a high level of brain activity.

• Your muscles are paralyzed during REM sleep, which prevents you from acting out your dreams.

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LensRetina

Blood vessels

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• Insomnia refers to difficulties falling asleep or staying asleep. Insomnia can be caused by stress or some physical problems.

Sleep Disorders

• Sleep apnea (AP nee uh) is a disorder in which a person stops breathing for short periods during sleep and then suddenly resumes breathing.

• Narcolepsy is a disorder in which a person experiences severe sleepiness during the day, or falls asleep suddenly.

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• Circadian rhythm (sur KAY dee um) is the body’s internal system for regulating behavior patterns during a 24-hour cycle.

Teens and Sleep

• Teens want to sleep later into the day and stay awake later at night than adults.

• Puberty affects the body’s circadian rhythm.

• Most teens need about nine hours of sleep each night.

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Teens and SleepTeens and Sleep

• Go to bed and wake up at the same times each day, even on weekends.

• Avoid bright lights at night. After waking, expose yourself to bright light as soon as possible.

• Avoid caffeine and sugary foods after noon.

• Exercise regularly, but not right before bedtime.

• Don’t fall asleep with the television on.

• Avoid all-nighters, which disrupt your sleep patterns.

• If you nap, do not let your naps interfere with your regular sleep patterns.

• If you can’t fall asleep, get up and do something relaxing until you feel tired.

Here are some tips to help you develop good sleep habits.

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For: More on teens and sleep

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Vocabularyinsomnia A disorder in which a person has trouble falling

asleep or staying asleep.

sleep apnea A disorder in which a person stops breathing for short periods during sleep.

narcolepsy A disorder in which a person experiences severe sleepiness during the day, or falls asleep suddenly.

circadian rhythm The body’s internal system that regulates behavior patterns during a 24-hour cycle.

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QuickTake Quiz

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For: Chapter 14 self test

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End of Section 14.4

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section 14.4 sleep and feeling fit slide 1 of 14 objectives describe why sleep is important for...

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