"开心的睡不着"可以用英语表达为"Can't sleep for the joy"或"Can't sleep because of the joy"。

这个表达的来源可能源自于人们常说的"Can't sleep for the excitement/anxiety"，即因为兴奋/焦虑而睡不着觉。在这个表达中，将兴奋/焦虑换成了开心，也就是说，人们因为太开心而睡不着觉。

下面是一些英文例句：

I can't sleep for the joy of knowing that I passed the exam. (我因为通过考试而太开心，睡不着觉。)
She can't sleep because of the joy of getting engaged. (她因为订婚而太开心，睡不着觉。)
He can't sleep for the joy of finally winning the championship. (他因为终于赢得冠军而太开心，睡不着觉。)