Inspired by my own recent thread about the words "sleep" and "dream", I thought I'd ask what are the words for "nightmare" and "daydream" (either nouns or verbs) in everyone's language. Do they have a literal meaning? Thanks. In Portuguese: Nightmare: pesadelo, from pesado, heavy (though pesadelo itself doesn't mean anything literally). There is no specific verb; we just say "to have a nightmare". To daydream: sonhar acordado, literally "to dream awake". There is no specific noun.