If you find that certain days or times of the day bring more valuable web traffic, you can have AdWords automatically adjust your bids to maximize on these patterns. For example, a coffee shop may want to bid more aggressively during its peak morning hours.
Figure out when you get the most valuable traffic. You can use the Dimensions tab in AdWords to analyze performance by day of the week or by hour.
You can also see performance data in your Ad schedule campaign settings page. Click on Schedule details and choose Day of the week or Hour and day of the week.