Vacation amnesia refers to this situation: when you come back to school or work from your vacation, you can’t remember what you did before the vacation. Things you can’t remember may include: what project you were working on, any paper needed to be finished, or even who was taking care of your business when you were on vacation.

“假期失憶癥”指的是這樣一種情況：你度完假回到學校或單位后發(fā)現(xiàn)已經(jīng)完全不記得度假之前你在做的事情。你當時正在進行的項目、有需要完成的論文、甚至度假時誰接手了你的工作都有可能不記得了。

For example:

Andy suffered from a bad case of vacation amnesia when he went back to school and couldn’t remember what he had been learning before.

安迪得了嚴重的“假期失憶癥”，他回到學校后根本不記得之前都學過些什么。