I have a longing to escape to a world that doesn't exist. Sometimes I might hear a song, see a picture or smell something that gives me a feeling of nostalgia, but there's nothing nostalgic about it. It feels the concept of a world I want to live in flashes through my brain and I'm left without any words to explain this world other then the fact that I want to be there. This feeling then draws a very melancholic state upon me which I would probably liken to what someone feels like when they return from holidays, but I've never taken any kind of extended holiday so I wouldn't know. I wouldn't necessarily call it a bad experience because the brief moment itself and the resulting pensiveness leaves me in a more sombre mood and I like to wallow in it for whatever reason. I'm curious if anyone is aware of any psychological phenomena that may explain what I'm experiencing, thanks.