一个巨难解释的英语句子---高手进

问题描述:

一个巨难解释的英语句子---高手进
Seeing that she was going off to sleep,I asked if she’d like that little doll on her bed.
我想知道 go off 还是 go off to是短语?
有人给我 go off 译为入睡,那么to sleep 是不是多余了?

go off 是短语.离开.
go off 是有睡去的意思.不过,我这里理解为是go off 离开而 to sleep 要去睡.