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This is an example of a genitive form known as an objective genitive, rather than an example of simple possession (if it were simple possession one might legitimately question whether an hour can actually possess sleep). We are really talking about 'a sleep of an hour', i.e. sleeping for an hour.

English only has few ways of indicating the genitive case, one of which is the apostrophe-s form. Thus "An hour's sleep" is correct.

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13y ago
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Q: Which is correct English An hours sleep or an hour's sleep?
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