Polyphasic sleep-reduction studies demonstrate that some people can function reasonably well on as little as __________ hours of polyphasic sleep per day

Gestalt psychology emphasizes

a. observable, objective reactions. b. the introspective technique. c. emotional causes of behavior. d. the basic human tendency to organize our perceptions.

Which explanation of why we sleep would predict that long-term sleep deprivation would cause cognitive declines and physical problems, such as an impaired immune system?

A) preserve and protect B) activation-synthesis C) restore and repair D) problem-solving