I'm broke.
我破产了。
What were you day dreaming about?
你刚刚做什么白日梦呢？
I could feel him zoning out on me as I was talking to him about work.
我在和他说工作的时候，我明显感受到他走神了。

Mumu was not all there when I asked her about her vacation.
当我问木木她假期过的如何的时候，她走神了。
Elsie was off-guard when she was in the meeting.
Elisie在开会的时候很放松。
He must have been out to lunch when he was in the class , because he failed the exam..
他上课肯定走神了，因为他考试没考过。

建议：
Sleep well.
好好睡觉。
Stay engaged during the day.
白天保持注意力集中。
Keep a journal to help you focus.
记日记对集中注意力有帮助。