I believe that it is indeed possible, though, I don't believe that it would happen without the dreamer having the will too. I don't think that you can erase a memory completely though, as someone had said above me I'm sure. It or they would still be locked away somewhere within the mind, which I suppose would be just the same as erasing it. Because you would never know it happened, therefore, it doesn't bother you anymore. I'm sure certain tactics could be invented to accomplish this, but you would have to have someone with you to test it. You could tell the person something that you're trying to forget, so the next day, they will tell you the memory. If you don't remember anything about it, it worked. Bleh, I ramble on to much.