Chronic Refractory Insomnia in a Patient With Undiagnosed Bipolar Disorder and Long-Standing Traumatic Brain Injury.

Traumatic brain injury (TBI), a form of acquired brain injury, occurs when a sudden trauma causes damage to the brain. TBI can result when the head suddenly and violently hits an object or when an object pierces the skull and enters brain tissue. TBI can be classified into primary and secondary brain injury.