Why is REM sleep also known as paradoxical sleep? A. Activity in the left hemisphere does not match the activity in the right hemisphere. B. We did not know it existed until its discovery in the...

Why is REM sleep also known as paradoxical sleep?
A. Activity in the left hemisphere does not match the activity in the right hemisphere.
B. We did not know it existed until its discovery in the 1950s.
C. It is deep sleep in some ways and light in others.
D. Because a pair of docs discovered it.