Question

Paradoxical sleep is to slow-wave sleep as ________ sleep is to ________ sleep.

Answer 1

The choices can be found elsewhere and as follows:

A) REM; Stage 1
B) Stage 1; REM
C) REM; Stage 2
D) Stage 2; REM
E) REM; Stage 4

I believe the correct answer is option E. Paradoxical sleep is to slow-wave sleep as REM sleep is to stage 4 sleep. Hope this answers the question.