How to activate post process when character [not camera] overlaps volume?

@MostHost LA
Now that’s an answer! To be honest I didn’t expect to get “sweet dreams” answer, that actually covers additional questions about gradual lerping. Many thanks!
As I said - I understand the logic more or less but I have small to none coding experience therefore I simply cannot come up with solutions even within blueprints. I tried to use level blueprint with capsule collision component and PP component as a child to establish boundaries but I would never have thought about casting, binding or anything that you explained so beautifully!