dream on

: a series of thoughts, images, or emotions occurring during sleep — compare rem sleep

: an experience of waking life having the characteristics of a dream: such as

: a visionary (see ¹visionary 2a) creation of the imagination : daydream

: to have a series of thoughts, images, or emotions while sleeping : to have a dream (see ¹dream 1)

: to indulge in daydreams or fantasies

: to appear tranquil or dreamy (see dreamy 3a)