Identify the stage of sleep described by using choices from the key. (Note that responses a–d refer to NREM sleep.) Key: (a) stage 1 (b) stage 2 (c) stage 3 (d) stage 4 (e) REM ____ (1) the stage when...

Identify the stage of sleep described by using choices from the key. (Note that responses a–d refer to NREM sleep.)

Key:

(a) stage 1

(b) stage 2

(c) stage 3

(d) stage 4

(e) REM

____ (1) the stage when blood pressure and heart rate reach their lowest levels

____ (2) indicated by movement of the eyes under the lids; dreaming occurs

____ (3) when nightmares are likely to occur

____ (4) when the sleeper is very easily awakened; EEG shows alpha waves