There... How did I arrive here? One does not open his broom closet and arrive on another planet, one does not fall asleep in his study and awaken in another world.

I cannot deduce what has brought me here, how it has done so nor for what purpose.

If I cannot even come up with a plausible scientific explanation for how I arrived, how can I then assume that my current location exists?

Even if I'd perhaps been kidnapped in my sleep, I'd still be on earth, somewhere, in a place with recognizable technology, in a land who's name fits into the languages of earth.

I would have a plausible explanation for my transport, and know the process in which I arrived.