Objective: To investigate the sleeping quality of the retired elderly for further epidemiological study about senile insomnia.

目的：调查老年人睡眠状况，为老年失眠症的研究提供更多依据。

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With the increase in the number of aged people, the incidence of senile dementia raises correspondingly. Decline of cognition ability is a key factor leading to dementia in the elderly.

我国老年人口逐渐增加，相应的老年痴呆的发病率也随之增加，而认知功能下降是老年痴呆的重要因素。

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According to the statistics, Chinas senile dementia patients has reached over 500 million people, there is an annual average of more than 30 million elderly people joined the ranks.

据统计表明，我国的老年性痴呆症患者已达500多万人，每年平均还有30多万老年人加入这个行列。

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