I remember this being a common concern when FaceID was first announced. I always wondered, is this a situation that many people are actually worried about? Who are people sleeping with or around who they don't trust? None of my business, I guess. In fact, even going as far back as when TouchID was introduced, I remember Apple having to explain that it won't work with a dead finger because people were concerned about having their fingers cut off to access their phones! I guess it's human nature to think of worst possible scenarios.