How the contents of the draft box go back to the latest edit

The problem is this: previously written in less than 3 of the article, placed in the draft box, and now re-edit from the draft box (soon finished) , and then halfway habitual ctrl+s a bit, but the page hint "whether to leave, unsaved will be lost", this is to know how to do, because ctrl+s to save the page. But this is not the point, the point is that I click No, thinking about editing, but suddenly jumped to the login account password interface, the normal login bar, and then directly to the editor, but the content of the article is the first time from the draft box out of the content of the time, the new editor is gone ... Duck Force, I think he has automatic preservation ah (the kind of the one-minute preservation), why is this? Is there any way to revert to just edit it? Help the big boys t_t

How the contents of the draft box go back to the latest edit