but it's difficult for them to fall asleep.的意思是什么?

问题描述:

but it's difficult for them to fall asleep.的意思是什么?
waiter(对应词)是什么 ,fall asleep的单独意思是什么?

但是他们难以入睡
waiter(男侍者)对应词waitress(女侍者)
fall asleep,入睡,睡着