"Whenever he is not sleeping or eating, he is working, " recalls Zhang, now at Harvard.

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"Once he gets like that, he is just sleeping but they can monitor him, " she said.

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"The bird doesn't actually hear his song when he is sleeping, because he is not producing any sound, " said Dr Deregnaucourt.

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The sanitation is a disaster and many are sleeping in roads and car parks, he adds.

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The details remain hazy, but it casts a "Chinatown"-size cloud over Ray and probably accounts for the state of his marriage -- which is over -- and the fact that he's sleeping on his dad's leaky sailboat.

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