And if so, how did we get inside his head?

For now, he was too much inside his own head.

I have the Books inside my head, and the knowledge.

She couldn't tell if the voice was inside or outside her head.

On second thought, I had a voice talking inside my head.

I know what you want, the voice said inside his head.

As a result, people line up to be inside his head.

I felt as if too much light were getting inside my head.

Trying to get inside my head, to see the world as I do.

Next thing I knew, her voice was talking right inside my head.