16.390 Trait Decreasing while Asleep. Update - Not a bug

[CurtB]

Notice a colonist losing trait points while asleep.  It was the construction trait (highest the colonist had)

[NolanSyKinsley]

Skills naturally decay if you are not actively using them. As soon as you stop doing construction, even in a minute or two, the skill points start going down slowly.

[Calahan]

As NolanSyKinsley says, there is a skill decay feature, whereby skills will decrease when not being used (although not below a certain level IIRC. Although that might have changed). Was it this you were observing? or something else?