three classes of dreams in 1901 -- wish fulfillments, anxiety dreams, and dreams in which the content is disturbing the feeling is not. …all three types, according to Freud, are motivated by a wish.

1^st?--the disguise is successful and the dream proceeds undisturbed,

2^{nd    --}the disguise is absent or insufficient; the forbidden wish emerges, causes anxiety, and the dreamer wakes up

3^{rd    --}the wish is particularly well disguised by a misalliance of content and feeling

1920  -- Beyond Pleasure Principle Freud could not sustain the view that all dreams have a wish-fulfilling motive. He amended his theory to include the newly discovered "repetition compulsion," which he related to the death instinct. [boldface added]

According to Freud, a dream is triggered when a thought or impression of the previous 24 hours connects with an impression from the past. The memory and report of the dream are its "manifest content," and the underlying dream-thoughts, accessible by interpretive means, are the latent content. The latent content is the result of what F called "primary process," or unconscious thinking.