A. Amphetamines B. Barbiturates C. Heroin D. Hallucinogens E. Alcohol 4. Which of the following statements about the typical pattern of sleep cycles is false? A. If someone has been sleep-deprived, he or she enters REM sleep sooner after falling asleep than he or she otherwise would B. Infants spend more time in REM sleep than do adults. C. Near the end of a good night s sleep, a person spends most of his or her time in Stages NREM-1, NREM-2, and REM. D. The first stage of sleep is NREM-1. E. We most often naturally awaken during NREM-3 sleep.​

E. We most often naturally awaken during NREM-3 sleep.

Explanation:

Sleep can be defined as a biological recurring state in which the mind and body of a living organism is characterized by altered (partial or total) consciousness, lessened sensory and muscular activities, as well as reduced physical interaction with the environment.

Generally, there are four (4) main pattern of sleep cycles and these includes;

I. Stage 1 sleep.

II. Stage 2 sleep.

III. Stage 3 sleep.

IV. Stage 4 sleep.

V. Rapid eye movement (REM) sleep.

Rapid eye movement (REM) sleep involves the movement of the eyes under the eye lids and this is the stage where dreaming occurs.

Hence, the statement about the typical pattern of sleep cycles which is false is that, we most often naturally awaken during NREM-3 sleep.