Googling led me to this page where the author had the same problem, and they found a solution in Safari Bookmarks Extractor. I can't test that it still works with version changes in both, but it probably does. Once you have your extracted bookmarks, you just use Manage Bookmarks -> File -> Import -> From File.
That's the thing...I don't have software to RECORD the events that occur while I'm away from my computer. As for turning the screen off: I lock my computer and shut the lid (for lack of a better term) since I use a laptop.