Jon is a warg for sure. They reference it and hint at it a bunch in the last book. He was told to keep Ghost around him as well. And a Wildling warg told him he has power and may not know it or realize it yet. And similar to Arya, they have "wolf dreams". And they're vivid. They can smell what the wolf smells and taste and sense what the wolf smells in their dreams. In reality, it's a good chance when they sleep they unknowingly warg out of their physical bodies. I think it's a Stark trait. An old magic in their blood that was gifted a long time ago. Some are more sensitive to it than others. Like Bran. And I honestly think it ties to magic over the wall with the wildlings and green children. That's why Ned was EXTREMELY devoted to the old gods.

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