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Hving an English problem

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So the thing is that, I'm not from an English speaking country n there's a sentence that I dun fully understand (from my psychology course): insomnia does not occur exclusive during the course of another sleep wake disorder, n actually the exact thing that I dun understand in the whole sentence is the term "does not occur exclusively", could anyone plzzzzzz kindly explain it in simpler eng... I kn I'm stupid :(