Congratulations you just experienced flight or fight. The fear drove your adrenaline to a point that you were frozen. Now that you know what fear can do, you better start learing how to deal with it or you will freeze up an no amount of training in any art is going to save your butt. This doesn't make you weak, so don't misconstrude my message. This is a natural response that you need to learn how to deal with. Do you sparr in class? If not, you need to start. MonkeyGirl, do you actually believe an attacker is going to give you forewarning? He froze, though he heard the person, he stopped to think, he did not react. Remember "Fear will cause hesitation and hesitation will cause your worst fear to come true". Anyone puttzing around 3 am in the morning is not usually out for a nice stroll. The best thing you did was get back inside, into a secured place. In the future, I would recommend 3 am kata training to be done inside the house.