What time of day people are viewing your shop can be a valuable bit of information to know. You could time new items to go up during the busiest time, and make changes during the slowest times. If you post frequently on twitter or facebook you might find the trend correlates heavily to when you are posting to those social media sites and make an effort to spread your posting out more to communicate with people who aren't online when you are usually posting.
So how do you find this out? Assuming you are using Google Analytics it's pretty easy though a bit hidden in the interface. Here's step by step how to do it:
Step 1: Log into Google Analytics.
Step 2: Click Visitors in the sidebar menu
Step 3: Click Visitor Trending
Step 4: Click Visits in the secondary menu under Visitor Trending
Step 5: Expand your date range. To get the best average you want to use a large date range. I used a year but if you haven't had Analytics collecting data that long you could do 6 months or since you installed Analytics. It's up to you but try to use at least several months worth of data to get the best picture.
Step 6: Click the Clock. Right over the visits graph on the right you will see some tiny icons, you want to click the one that looks like a clock face.
Step 7: Analyze the information. In my case my least views are at 6am and the most at 5pm for my time zone. Google uses a 24 hour clock not a 12 hour one which can be a bit confusing if you aren't used to it, just subtract 12 from times past 12:59 (14:00 is 2pm).