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

Question

Quizplus · Accepted Answer

As individuals age and reach old age, there is a decrease in the amount of time spent in deep sleep. This is due to changes in the brain, including a decrease in the production of growth hormone and changes in neurotransmitter activity. NREM-1 sleep remains relatively stable throughout the lifespan, while paradoxical sleep (also known as REM sleep) may increase slightly in older adults but overall remains relatively stable. The speed of completing the sleep cycle may also slow down with age, but this is not as significant as the decrease in deep sleep.

Compared with When They Were Only 20 Years Old, 60-Year-Olds