Morris Nelson's page

While the ability seems pretty cut and dry, I'm wanting to make sure there's not something I'm overlooking. Here's the description of the ability:

Deathly Delusion (Su)
Challenge Rating: +0.

The ghost died suddenly or unexpectedly. Not even realizing it’s dead, this spirit goes about the routines of its daily life, ignoring the living in a state of undead denial. Should a ghost with this ability pass through the square of a living being, that creature must make a Will save or fall into a fitful sleep full of nightmares that aren’t its own for 1d4 minutes. For a number of following nights equal to the ghost’s Charisma modifier, the victim must make an additional Will save or be affected as per the spell nightmare.

So, could I theoretically just float around the battlefield moving through the square of my enemies and putting them to sleep one after the other (if the fail their saves, of course)? Does passing through a living creature's square require some kind of save for them to resist me going through them? Would they get some kind of Reflex to avoid me?