Normally, the number of cycles of sleep stages that occur per ...

[APUS57]

Normally, the number of cycles of sleep stages that occur per night is ____ cycles.
 
  a. 4 to 6 c. 8 to 10
  b. 6 to 8 d. 10 to 12

Question 2

During a typical night of sleep, a normal adult sleeper cycles between non-REM sleep and REM sleep at approximately every ____ minutes.
 
  a. 30 to 60 c. 90 to 120
  b. 60 to 90 d. 120 to 150

[kiamars2010]

Answer to Question 1

ANS: A
Normally, 4 to 6 cycles of sleep stages occur per night.

Answer to Question 2

ANS: C
During a typical night of sleep, a normal adult sleeper cycles between non-REM sleep and REM sleep approximately every 90 to 120 minutes.

[APUS57]

YES! Correct, THANKS for helping me on my review

[dyrone]

Thanks for the timely response, appreciate it