Shit, that's a good idea.

[This is why she needs someone who's a sorcerer as well as a doctor. (Should she try to learn magic? Questions for another day.)]

Not one without some risks, but if Tav's being honest about how he feels, I think he'd probably give informed consent if it has a chance of working. Maybe one of the native mages might have some ideas about the approach, too. I know part of their training is lucid dreaming so they don't get sucker-punched by demons in the Fade while they're asleep.