Introduction to Psychology 10th Edition by Rod Plotnik,Haig Kouyoumdjian

Exercise 18

About every 30-90 minutes throughout sleep, you leave stage 4 (delta sleep) and progress backward to stage 2. From stage 2, you enter a new stage of sleep marked by high-frequency, low-amplitude brain waves that look identical to (a) _____waves. This stage is called (b) _____sleep because your eyes move rapidly back and forth underneath closed eyelids. During this stage, you are asleep and lose muscle tension in the neck and limbs. However, your brain waves are like those when you are awake and alert, and there is increased arousal of many physiological responses. When awakened from this stage, people usually (80-90% of the time) report that they have been (c) _____.