Describe what happens when people sleep,key theories of why we sleep and dream,and problems with sleep and how they affect functioning.

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The Answer is -Every 90 to 100 minutes when we sleep,we pass through a sleep cycle consisting of five different stages.The fifth stage of sleep,rapid eye movement,or REM sleep,is characterized by rapid and jagged brain-wave patterns and eye movements and irregularities in heart rate and breathing.Dreaming usually occurs during this phase of sleep.
-Scientists have identified brain activities that maintain the regular rhythms of life.Our move from a sustained period of wakefulness into a period of sleep during each 24-hour period is known as a circadian rhythm.
-Scientists have not reached a definitive conclusion about why people sleep,although some scientists have suggested sleep serves an evolutionarily adaptive function,keeping our ancestors away from predators that hunted at night.Others have suggested that sleep might play a role in growth,or allow us time to restore depleted chemical resources in the brain and body and eliminate chemical wastes that have accumulated throughout the day.
-We also do not understand why people dream.Recent theories about dreams emphasize cognitive approaches.The information-processing theory of dreams suggests that dreams are the mind's attempt to sort out and organize the day's experiences and fix them in memory.The attention-synthesis hypothesis suggests that dreams are the mind's attempts to give meaning to internally generated signals firing throughout the brain during deep sleep.Freud believed that dreams represent expressions of the internal desires and wishes that have been repressed and stored in the unconscious.
-Sleep deprivation can lead to feelings of fatigue,irritability,and malaise,resulting in lower productivity and a tendency to make mistakes.Loss of sleep can also affect the functioning of the immune system.The regular inability to fall asleep or stay asleep is called insomnia.Other sleep disorders include sleep apnea,narcolepsy,sleepwalking,and night terrors.

Describe What Happens When People Sleep,key Theories of Why We