Let's do this interactively. Would you like to write down the associations you have for these words: dream - chemical - madness - Then I'll tell you all the interesting things that they trigger in my mind. Also tell us where you saw this sentence. What was the context?

It seems that it is NOT a regular meaning of madness! In my opinion it means that every one likes to come back to his/her youth dates! Because any one has a lot of memories about that period. Regards

每个人年轻的时候都充满了梦想和疯狂。