which description of John indicate that the narrator does not trust him?

From the text:

It is a very bad habit I am convinced, for you see I don't sleep.

And that cultivates deceit, for I don't tell them I'm awake—O no!

The fact is I am getting a little afraid of John.

He seems very queer sometimes, and even Jennie has an inexplicable look.

It strikes me occasionally, just as a scientific hypothesis,—that perhaps it is the paper!