This image depicts the sleep cycles over the course of a typical night. In which stage do delta brain waves exceed 50 percent of total brain activity?

A) stage 1 NREM
B) stage 2 NREM
C) REM sleep
D) stage 4 NREM

Question

This image depicts the sleep cycles over the course of a typical night. In which stage do delta brain waves exceed 50 percent of total brain activity?

A) stage 1 NREM 
B) stage 2 NREM 
C) REM sleep 
D) stage 4 NREM

Quizplus · Accepted Answer

Delta brain waves are the slowest brain waves and are typically associated with deep sleep. Stage 4 NREM is typically the deepest stage of sleep and is characterized by more than 50% delta brain wave activity.

This Image Depicts the Sleep Cycles Over the Course of a Typical