Summer and Freddy are walking through the woods late at night. "It's so dark out here, we could walk over a cliff without even knowing it or get attacked by a bear!" says Freddy,

"We should be asleep in bed instead of walking around at night." Freddy's comment reflects the logic behind which explanation of why we sleep?
A) activation-synthesis
B) preserve and protect
C) restore and repair
D) problem-solving

Answer: B
Rationale: The preserve and protect hypothesis suggests two more adaptive functions of sleep: preserving energy and protecting the individual organism from harm. To support this hypothesis, researchers cite that the animals most vulnerable to predators sleep in safe hideaways and during the time of day when they are most susceptible.