In which book does augustine use the analogy of a waking man wanting to get out of bed but pulled back to sleep by his tired body to show that there are often two conflicting wills within us?

It was in Book VIII that Augustine used the analogy of a waking man that wanted to get out of his bed.
In Book VIII, it informs about the story of Augustine’s conversion experience in Milan, where it starts in an agonizing state of spiritual paralysis and concludes with a euphoric decision, which directs in wholly embracing celibacy and the Catholic faith.