Question

Compared with when they were only 20 years old, 60-year-olds ________.

1) spend less time in deep sleep
2) spend less time in stage 1 sleep
3) spend more time in paradoxical sleep
4) complete the sleep cycle more slowly

Answer 1

Compared to when they were 20 years old, 60-year-olds have changes in their sleep patterns including less time in deep sleep and stage 1 sleep, and a slower completion of the sleep cycle.

Step-by-step explanation:

Compared with when they were only 20 years old, 60-year-olds spend less time in deep sleep, spend less time in stage 1 sleep, and complete the sleep cycle more slowly.