PLMD经常会导致失眠（难以入睡和睡眠维持困难）以及白天严重嗜睡。

PLMD usually causes insomnia (difficulty initiating and maintaining sleep) and, more rarely, excessive daytime sleepiness.

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入睡困难和睡眠维持障碍（早醒伴再入睡困难）是最常见的症状。

The most common symptoms included difficulty in falling asleep and sleeping disturbance.

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事实上，老年人更容易在睡眠维持方面出问题，而年轻人则往往是难以入睡。

Actually the elderly are more prone to sleep maintenance problems whereas younger people tend to have trouble falling asleep.

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