Red Dots appearing on duplicant faces.

I've noticed red dots appearing on the faces of duplicants whenever they eat and sleep.
If my memory doesn't fail me this has been happening even before the thermal update.
When I finally decided to get on the forums (Something I admittedly probably should've done sooner.) I was surprised to find nobody had reported this before.

I recall this also happening when the duplicants harvested water. I haven't played in a while and I don't recall every other instance where this happens. However if I see a new instance of a red dot appearing I'll make a screenshot.

The red dots don't stay on the duplicants after they finish their animation, it disappears and reappears. But when it appears once it seems to consistently reappear whenever they eat and sleep. As I said, I recall the red dot also appearing during other animations and if I see it happening again I'll make sure to screenshot it.