When asleep, your spirit leaves your body to form a physical wolf. You body will continue to sleep, and can not be awoken until your spirit wolf returns to it. You gain the full benefits of a night of sleep.

Your wolf's spirit can commune with the animals of the forest, especially other wolves. If you are nice enough, one may ever follow you as a companion.

Even in your humanoid form, you can follow the scents and sounds better than other humans. (Advantage on Naturecraft and Perception)

(WIS/Safe Rest) You can call forth your spirit wolf in a time of need. Your body will go inert, might want to lay down first.

(WIL/Safe Rest) You extend your spirit to another's, and help them heal their own body. (They roll one of their's or your's hit die for free)