Stage 4 sleep is also called paradoxical sleep because even though it's the deepest stage of sleep, you still move around a lot.

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Quizplus · Accepted Answer

Stage 4 sleep is actually NREM sleep and it is characterized by very little movement. Paradoxical sleep is another name for REM sleep, which is characterized by high brain activity and rapid eye movements, despite being a type of sleep where the body is otherwise still.

Stage 4 Sleep Is Also Called Paradoxical Sleep Because Even