Final answer:
True. During sleep, certain areas of the brain are more active than during wakefulness, and this is reflected in the patterns of brain wave activity during different sleep stages. The brain areas responsible for sensory perception, integration, and eye movement are active during sleep. Some evidence suggests that about 80 percent of the brain is active during specific tasks.
Step-by-step explanation:
During sleep, certain areas of the brain are more active than during wakefulness. Sleep is composed of different stages, each characterized by unique patterns of brain wave activity. In non-REM sleep, there are three stages marked by delta waves, while REM sleep is characterized by brain wave patterns similar to wakefulness. The brain areas responsible for sensory perception, integration, and eye movement are all active during sleep. Some evidence suggests that about 80 percent of the brain is using energy during well-defined tasks.