An injury to Head/brain can hamper sleep -wake cycle.
other than that injuries to other regions can also hamper the sleep-wake cycle, because the pain could be unbearable resulting in loss of sleep.
So it is also dependent on kind and severity of the injury.
Hypothalimus... Starting at the top as 1, then going counterclockwise being 2, it would be that next one. Number 2. The two in back are 3 and 4. So, #2 is hypthalimus
