不由自主-----in spite of oneself

例句：
A: How come he is often punished by the teacher?
他为何经常被老师处罚？
B: He's often absent-minded and dozed off in spite of himself in class.
他经常上课心不在焉且不由自主地打瞌睡。

注释：
absent-minded 心不在焉
doze off 打瞌睡