到目前为止所有给你的答案都不是英文!实在令人惊讶!
My son sat there dozing with an upside-down textbook in his hand.
With an upside down textbook in his hand,my son sat there dozing.
Holding an upside down text book,my son sat there dozing.
满脸困意只是疲倦而没有睡着,不可能倒着拿课本,如果改用dozing,打瞌睡比较合逻辑.