1. Scientific sleep researchers all share which of the following sets of attitudes?

A. They want to make direct observations of sleep-related phenomena and do not claim that something is likely to be true unless there is sufficient observational evidence.
B. They do not believe anything other sleep researchers claim to be true unless they have tested it themselves in their own laboratories; and they tend to stick to their own theories because of the difficulty of studying sleep.
C. They readily accept the ideas of those sleep researchers that came before them and usally accept a claim if most researchers already seem to believe it.

2. Before they started their research, Aserinsky and Kleitman believed that

A. when we dream, the brain and the body "wake up" at times during the night, even though we are deeply asleep.
B. brain activity decreases gradually during sleep and doesn't start to increase again until we begin to wake up.
C. brain activity is not important for sleeping and waking, which is why they initially decided to focus on other factors.

3. Rapid-eye movement (REM) sleep is associated with which of the following?

A. sleep walking
B. increased brain activity
C. sleep talking
D. all the above

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