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Unformatted text preview: changes over time. In very young babies, about half of all sleep is REM sleep. As babies get older, the proportion of REM sleep decreases. Sleep Disorders Everyone has occasional difficulty sleeping, but some people have insomnia , a chronic problem with falling or staying asleep. Another kind of sleep disorder is narcolepsy , which is a tendency to fall asleep periodically during the day. Narcolepsy can be dangerous, as people who experience it may fall asleep while driving or operating machinery. Sleep apnea is another condition that can have negative effects on health and safety. People who have sleep apnea stop breathing many times during a nights sleep, and each time they stop breathing, they wake up briefly and gasp for air. This prevents them from getting enough deep sleep, which leads to irritability and sleepiness during the day. Chronic sleep apnea can also result in high blood pressure....
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- Winter '09