The ghosts or visions or whatever are haunting, frightening. Booth goes to the sensoriums for a while, unable to sleep, but there really isn't any getting away from the fear.

He sees so many...people he killed as a sniper, people he arrested.

He sees Parker, his Army comrade.

Howard Epps. He's seeming to taunt him, to mock him. "You let go and you know it. You got your revenge. Did you enjoy it?"

The worst is his father, however. "You're worthless, and you'll always be worthless. You hear me, boy? You'll never amount to anything!"

He feels the stinging slap of his father's hand, and then a thud as he hits a wall. Later, there's a very real bruise on his side. He isn't sure if he can talk to Temperance about it or not.