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Dwayne and his nine-year-old son are sitting at the breakfast table and talking about various things. The son mentions a dream he had about his favorite toy. Dwayne mentions a bizarre dream he had the previous night. These differences in the content of dreams is best explained by __________.

Psychoactive drugs are drugs that __________.

As we sleep during the night, we spend the majority of our time in __________ sleep.

“I don’t know what is wrong with me,” says Lucy. “It used to take just a couple of drinks to get me ‘going,’ but now it takes four or five.” What is Lucy exhibiting?

Nestor is in the middle of a fantastic dream. What is his body doing?

__________, a hormone that triggers feelings of sleepiness, is released at higher levels when you are in dark surroundings.

Delta waves occur more than 50 percent of the time in stage __________ sleep.

The white part of the eye is the __________.

Loudness is associated with a sound wave’s __________.

A disorder of the inner ear would be most likely to impact our ___________.