From what stage of sleep are people typically most difficult to arouse?
A) NREM, alpha waves
B) NREM, sleep spindles
C) NREM, delta waves
D) REM

Question

Quizplus · Accepted Answer

Stage III of NREM (delta wave)is the deepest stage of sleep-not REM.It is difficult to awaken someone in stage III slow wave NREM sleep,and if she is awakened,the person may appear confused and react slowly.Stage I NREM is a light sleep from which the sleeper can easily be awakened.Stage II (sleep spindles)is also light sleep; the sleeper in this stage is easily roused.REM sleep is the stage at which most dream activity occurs,as well as more spontaneous awakenings.

From What Stage of Sleep Are People Typically Most Difficult