Isn't it "we" not "ourselves" in "had ourselves"? Please explain the sentence structure.
This sentence is a British style of speaking and structuring sentences, where the speaker talks about the other person as though they are talking about themselves, and uses the plural form. It is a familiar way of speaking to someone. As an English learner, you can say "I see you had a late night snack" to have the same meaning as this sentence.
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