Wondering about step-dad's 24 hour loss of consciousness and what kind of head trauma would cause that. Apparently it would have to be something pretty significant and surely the hospital will know if his story is legit. www.mayfieldclinic.com/PE-TBI.htm Traumatic brain injuries are classified according to the severity and mechanism of injury: Mild: person is awake; eyes open. Symptoms can include confusion, disorientation, memory loss, headache, and brief loss of consciousness. Moderate: person is lethargic; eyes open to stimulation. Loss of consciousness lasting 20 minutes to 6 hours. Some brain swelling or bleeding causing sleepiness, but still arousable. Severe: person is unconscious; eyes do not open, even with stimulation. Loss of consciousness lasting more than 6 hours.