Co2 Improve?

Luke had an ok ish night with only one minor episode at about 4am. For most of today he has been allowed to be awake and sems to be quite happy. In fact I have noticed have noticed his Co2 levels have dropped a little over the last few days and today he did not need to be veced out while he was awake and his PEEK pressure dropped to 18 at one point and hovered around 20/23 which is the best its been for weeks. I am wondering if this is anything to with him turning his head more to the center when I was playing with him making the airway clearer - and of course hopefully getting a bit better too!