I am interested in sleep quality measuring and by seeing this paper:

Towards Benchmarked Sleep Detection with Inertial Wrist-worn Sensing Units

I have seen this part paper:

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So i like to know which one could better estimate sleep quality ; polysomnography (PSG) indexing or Pittsburgh Sleep Quality Index (PSQI) or any more completed index ( which i don't know now!)?


Maybe based of this paper part diary are better indexing?:

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