DaraMarkos

26.02.2021 19:41

Английский язык

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Words progress
drift
passive
interspersed
paralyzed
stages
shallow
exclusively
sensation
jerk

Though we imagine sleep as a passive activity without physical movement, it is actually an active, dynamic activity. When we sleep, our minds and bodies go through five stages of sleep over and over again. This is the sleep cycle we through. Adults and children, especially infants, spend different amounts of time in the different stages.
In stage one, we in and out of light sleep. Sometimes we feel a sensation of falling, and our muscles might jerk as if we are suddenly startled. In stage two, our brain waves become slower and eye movements stop. In the third stage, slow delta waves are jerk with faster waves. The brain continues producing delta waves almost through stage four. Stages three and four are called deep sleep, with no muscle activity or eye movement. If you are awakened during deep sleep, you will be groggy for a few minutes Rapid Eye Movement—REM sleep—is the fifth stage of sleep. Breathing becomes fast, irregular, and shallow. Our eyes in many directions. We find the muscles in our arms and legs are temporarily . Blood pressure and heart rate both rise. This is the time when we dream. If you wake up during REM sleep, you might recall strange dreams that link real life with fiction. Then the cycle starts over again.