I used to have three imaginary friends. They were named Honour, Grrr and Lion and I had no clue they were anything but real. I spent hours with them as a young child.
Apparently this is quite normal and even healthy. It's part of a child's imagination that is just developing. The fantasy world inside a child's head is nothing that shouldn't be encouraged. In fact, these invisible pals provide a source of comfort and companionship.
Honour, Grrr and Lion left me when I began to distinguish between fantasy and reality. For just one night, I wish I could set the dinner table for three more. Good friends like them come around once in a lifetime. They left me high and dry when I needed them most. Reality bites.