Yahoo places my ads on HotJobs. They run them overnight and my budget is depleted by 8am every morning. If I didn't know better, I would swear that Yahoo is clicking on the ads themselves. Who's clicking on these ads at 3 and 4 o'clock in the morning? How do you stop them from running at these times. It's easy to do in Adwords, but how do you do ad scheduling in Yahoo?