How can resolve the disturbed sleep by partner's snoring?

So we've been together for over 4 years and he is snoring but not even once it bothered me until yesterday. All of a sudden I can't stand his snoring and I have trouble falling asleep. But I don't get it why it started bothering me just now. Is that normal? And what are some ways to resolve this?

How can resolve the disturbed sleep by partner's snoring?
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