How does REM (Rapid Eye Movement) sleep typically change with aging?

Correct answer is C) Decreases in duration and frequency. As individuals age, there is a normative decline in the duration and frequency of REM sleep. Older adults often experience a reduction in the total time spent in REM sleep, and the cycles of REM sleep become shorter and less frequent. These changes are part of the natural aging process and are observed in conjunction with alterations in overall sleep architecture. Understanding the age-related changes in REM sleep is essential for interpreting sleep patterns in different age groups and recognizing potential sleep-related disorders in older individuals.