I have a lot of people coming my way and they're freaking out. I'm not getting any deep sleep. I'm not getting any REM, et cetera. Usually the application nowadays is that we're tracking with some sort of element of a sleep tracker. The problem is, is that this is the least accurate data on our wearables.

It's using its own algorithm within each wearable to make its best guess on, are you in deep sleep? Are you in REM? Are you in light sleep? And the problem is, is that because it's that best guess, if the algorithm is changed, your results with your sleep staging is going to be markedly shifted.

So my big message for people, if they are tracking, is one, to not get too crazed about the REM deep sleep and your light sleep. Instead, you can look from a trends perspective within each wearable. You can start to notice particular trends and see are there patterns that you can help support based on those trends.