Couldn't you reduce your position just before the close if you think you should hold overnight? As to your question if you will eventually get caught by bad news, the answer is 'yes'. You must simply accept it. I have accepted the fact that anything can happen in the market at any time because that is the nature of life - if you want to live then you actually have to take the risk of something very bad happening to you at any time. So just reduce the risks to an acceptable level and enjoy the rewards