What finding suggested that the brainstem area below the midpontine cut played an important role in sleep production?

Question

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A transection through the pons leading to no signs of sleeping suggests that the brainstem area below the midpontine cut, which includes the pons, plays an important role in sleep production. This is because the disruption of this area results in the absence of sleep, indicating its involvement in sleep regulation.

What Finding Suggested That the Brainstem Area Below the Midpontine