Synonyms to bad dream

brown study, Walter Mitty, absence of mind, absentmindedness, absorption, abstractedness, abstraction, bemusement, castle-building, close study, concentration, contemplativeness, daydream, daydreamer, daydreaming, deep thought, depth of thought, dream, dreaming, engrossment, fantasy, fantasying, fit of abstraction, incubus, melancholy, mooning, moonraking, muse, musefulness, musing, muted ecstasy, nightmare, pensiveness, pipe dream, pipe-dreaming, preoccupation, profound thought, reflectiveness, reverie, speculativeness, stargazing, study, thoughtfulness, trance, vision, wistfulness, woolgathering, airy nothing, autism, be absent, bubble, chimera, conceiving, deception, deluded belief, delusion, dereism, divagate, dream of, dream vision, dreamland, dreamworld, false belief, freak out, go woolgathering, ignis fatuus, illus