My dreams center around a growing change to the population known as 'mutation', and how normal humans tend to fear and hate them. The psychic abilities I have there make me a mutant, and I've faced some of these things myself.
It's varying degrees, there are some mutants who cannot pass as normal at all - radical changes to their shape or skin tone, for instance. I would be one of the lucky ones who look completely human and can pretend I'm not a mutant if I wish, which I tend to do at this point.
We know of the existence of aliens, yes, a few of them. I have not of course met any of them personally.