A single cycle of non-REM and REM sleep lasts about a. 10 ...

[Diane]

A single cycle of non-REM and REM sleep lasts about
 
  a. 10 minutes.
  b. 30-40 minutes.
  c. 90 minutes.
  d. 360 minutes.
  e. 8 hours.

Question 2

Which of the following is true of human sleep cycles?
 
  a. Sleep cycles are random across the night.
  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. Stage 3 of slow-wave sleep mostly occurs in the early morning hours.
  e. Each non-REM/REM cycle lasts about 45 minutes.

[milbourne11]

Answer to Question 1

Answer: c. 90 minutes.

Answer to Question 2

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

[Diane]

TYSM

[xiazhe]

Gracias!