As people age, how does the proportion of REM sleep to non-REM change?
A. The proportion of REM sleep decreases whereas the proportion of non-REM sleep declines.
B. The proportion of REM sleep decreases whereas the proportion of non-REM sleep stays the same.
C. The proportion of REM sleep increases whereas the proportion of non-REM sleep declines.
D. The proportion of REM sleep increases whereas the proportion of non-REM sleep stays the same.
Answer: C
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