Sleep disorders not only reduce the efficiency of daytime study and work.
It also increases the likelihood of developing lifestyle-related diseases such as heart disease, cerebrovascular disease, diabetes, and obesity.
It also increases the probability of developing dementia in old age if it is not corrected.
In Japan, it is estimated that one in five elderly people will develop dementia by 2015.
Japan is focusing on improving sleep disorders, which are a distant cause of dementia.
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