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Home Q & A Board Biology-Related Homework Help Medicine
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6 years ago
Which of these statements about the sleep cycle is TRUE?
 
  a. Each cycle begins with two stages of non-rapid eye movement (NREM) sleep in order.
  b. Each cycle ends with the last three stages of NREM sleep in reverse order.
  c. Each cycle lasts 20 to 30 minutes.
  d. The typical person will have four to six sleep cycles during a 7- to 8-hour sleep period.
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6 years ago
D
The sleep cycle is the sequence of sleep beginning with the sequential stages of NREM sleep, a return to stage 3 and then stage 2, followed by the first REM stage. A sleep cycle is usually 70 to 90 minutes in duration, and the typical sleep passes through four to six cycles during a 7- to 8-hour sleep period.
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