An injury to which region would interfere with the sleep-wake cycle?

Hypothalamus

Explanation:

The hypothalamus works to maintain homeostasis, that is, the chemical balance of the body. Despite its size, it is of great importance for the normal functioning of most of the body's systems. Its operation is similar to a thermostat. When any chemical element or substance is at high or dangerously low levels, based on the metabolic functioning of each individual, the hypothalamus seeks to alert the system that it is necessary to reduce that substance or activity in the body.

The hypothalamus is the main regulator of the sleep-wake cycle, in this case, if the hypothalamus were injured, the individual would have problems maintaining the balance between sleep-wake cycle.

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