All sorts of fitness trackers and bed sensors say they quantify sleep. But once you collect data, what do you do next? PC Magazine reports.

Collect Additional Data to Correlate
The problem is that knowing what times of night you tossed and turned, or how much time in bed you spent asleep or awake, isn’t enough information to guide you to make changes that will help you sleep better.

You need to collect other data about your life, too, that can affect sleep so that you can look for correlations and test hypotheses about what affects your sleep.