This actually relates to the Party's governing in the following way: They replace memories with dreams.
"Nineteen Eighty-Four" was written by George Orwell. The Party was a symbol of Big Brother. The Party was known to weaken people's minds and fill with propaganda. They replace people's memories with their own version of truth.
It became impossible for people to question the Party's power.
The dream that Winston had that brought repressed memories actually relates to the fact the Party replaces people's memories with dreams.
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