曰:老人臥而不寐,少壯寐而不寤者,何也?
然:經(jīng)言少壯者,血氣盛,肌肉滑,氣道通,營衛(wèi)之行不失于常,故晝?nèi)站共诲灰?。老人血氣衰,肌肉不滑,營衛(wèi)之道澀,故晝?nèi)詹荒芫?,夜不得寐也。故知老人不得寐也?/p>
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