Notes are a good idea. Although I would assume they are regularly conscious and aware of your surroundings to at least some small extent. [Diavolo certainly was, and Cervo, too, now] Talking to them would work just as well. Although few, I think, would be brave enough for that.

[Doppio is a glaring exception to that rule. No questioning, no doubt, no shame. Pick up the "phone" and speak.]