Which of the following statements about human sleep cycles is true?
A) After each successive cycle, time spent in REM sleep decreases by half.
B) Typically, an individual experiences four to five sleep cycles each night.
C) The sleep cycle pattern is consistent for an individual across the lifespan.
D) The time spent in stages 3 and 4 of NREM sleep increases in the later sleep cycles.

Question

Quizplus · Accepted Answer

Typically, an individual experiences four to five sleep cycles each night. The other statements are false. After each successive cycle, time spent in REM sleep increases and the time spent in stages 3 and 4 of NREM sleep decreases. The sleep cycle pattern can vary across the lifespan.

Which of the Following Statements About Human Sleep Cycles Is