We all have phones these days, and many of us have smart watches that track our steps. Personally, my favourite feature of these device is the sleep tracking. I started off with Fitbit and now I'm transitioning to the Apple Watch. Interestingly enough, when I wear BOTH wearable to bed, the numbers don't always align. Let's dig a little deeper there. Let's pull the data into a data lake and normalize the structure of the data and create a confusion matrix and see where the two products diverge in their sleep analysis.