The word 做梦 is formed by directly combining the character 做, meaning "to do" or "to make", with the character 梦, meaning "dream". It creates a literal, action-object compound where the act of "doing" is applied to the noun "dream", effectively picturing the process of generating or experiencing a dream. This straightforward pairing results in a meaning that encompasses both the physiological act of dreaming during sleep and the metaphorical idea of indulging in a fantasy or daydream.