The biggest plot hole and my theory around it.

I know that just like all animes and movies in general, Conan has many plot holes that just don't make sense. But to me the most annoying one is "sleeping Kogoro".. how can all these people in Conan universe just accept that a man is speaking while he is litteraly asleep, not even moving his lips, don't they ask themselves where's the voice coming from?. And how can a former cop and now detective not even questions why in every case he just wakes up and remembers nothing? Is he that dumb? The only theory I could think of regarding this is that Kogoro knows everything and he's playing along to protect Ran and Shinchi. It's the only way I imagine Gosho Aoyama can fill this plot hole in the future if he ever intends to.

I know that just like all animes and movies in general, Conan has many plot holes that just don't make sense. But to me the most annoying one is "sleeping Kogoro".. how can all these people in Conan universe just accept that a man is speaking while he is litteraly asleep, not even moving his lips, don't they ask themselves where's the voice coming from?. And how can a former cop and now detective not even questions why in every case he just wakes up and remembers nothing? Is he that dumb? The only theory I could think of regarding this is that Kogoro knows everything and he's playing along to protect Ran and Shinchi. It's the only way I imagine Gosho Aoyama can fill this plot hole in the future if he ever intends to.