Board Thread:Questions and Answers/@comment-73.54.193.144-20170429024504/@comment-75.170.84.185-20170528191528

I don't think you will want to remove them. When you send a wake-up, you get extra stuff... and you can still visit their station when trains/mail are at the station. Granted, they won't send gifts, but they still receive gifts, which counts towards completing one Achievement.