Which of These Statements About the Sleep Cycle Is TRUE

Multiple Choice

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.