This is integral to my story, so it's important I figure out a different way to go about this now if it's completely unrealistic. I was so busy formulating my idea that I kind of skipped over the fact that this might not make sense until now. Let's say a little girl (maybe ten years old) finds a portal to another dimension, goes into that other dimension for an hour or two, meets a little boy, goes back to her dimension, but then years go by and she doesn't find the portal again, even when she goes back to the very same spot. Is it realistic that 1) she would eventually believe it was just her imagination and never really happened, and 2) that the memory would eventually become vague, like a dream you can't quite remember, by the time she's in her twenties? More thoughts/details: If she tries to tell people after it happens and they all tell her how ridiculous that is or just laugh it off saying she has such a big imagination, would that make it more realistic for her to believe maybe it really was a dream or her imagination? Also, would it make it seem more likely for her to believe it were a dream if I said the place she found the portal is in a place where it would be very easy to fall asleep and where people do often fall asleep? If she believes it was just imagination/dream, would that make it more likely for her to push it to the back of her mind and forget about it? Because I really want her to forget about it and have it be really vague in her mind, but I'll adjust what I have to in order to make it more realistic. Also, just to clarify, all characters are human and this takes place on Earth.