Well hello! :-) I've always found these false dream memories fascinating. I remeber one where I had a brother who I was very close to. When I awoke, I realized that no such brother existed!

Perhaps these "memories" we have in dreams reinforces the "seeing is believing" idea, which can be important to survival. Like when a suicidal animal owner in Ohio, US released tigers, lions and other exotic animals to roam nearby residential areas. Safer to accept there's a tiger is walking up the street than to question reality. It's like dreams are always trying to get us to accept a situation no matter how odd. Hope I made some sense :-)

On a side note, there was news some time ago that ads can make people believe they've eaten food that they'd never actually tried: Ads Implant False Memories - Wired Science Makes you wanna keep a daily journal of your waking life too!