About ________ of the population experience insomnia as a ...

[Kthamas]

About ________ of the population experience insomnia as a persistent problem while ________ experience insomnia on an occasion.
 
  A) 1 percent; 3 percent
  B) 15 percent; 52 percent
  C) 27 percent; 45 percent
  D) 7 percent; 19 percent
  E) 9 percent; 25 percent

Question 2

Which of the following is true of the sleep cycle during a night of sleep?
 
  A) Each non-REM/REM cycle lasts about 45 minutes.
  B) Subjects first enter REM sleep and then transition to non-REM sleep.
  C) As the night goes on, the relative length of REM sleep increases in each successive cycle.
  D) Stages 3 and 4 of slow-wave sleep mostly occur in the early morning hours.
  E) Sleep cycles are random across the night.

[HandsomeMarc]

Answer to Question 1

Answer: E

Answer to Question 2

Answer: C
Rationale: As the night goes on, the relative length of REM sleep increases in each successive cycle.

[Kthamas]

TYSM

[xiaomengxian]

YES! Correct, THANKS for helping me on my review