There ar two worlds: the inner and the outside. Every person has both, and lives in both of them. But there is a boundery between them. And when it's erased, the two worlds begin to clash.
When the person begins to live only inside the inner world, everything begins to change. Because it is all different there. The outside things, views, noises become unreal. And everything what seemed to be unreal and unimportant in the inner world becomes the main theme in our lifes. Things change there priorities to the opposite. And the vicios circle begins to lock. We begin to live inside ourselves. Inside our bodies and our minds, our consciousness. And yes, it is hard to get out of that place. And yes, the reasons are unknown.