Fell asleep leaning on chin implant at 6 weeks post-op. Could I have shifted the implant?

After 6 weeks, the implant is securely in place, It is highly unlikely that any shifting occurred. I would take the following things into consideration:1) Has the appearance changed?2) Is there any swelling in the area? If you have any concern, I would recommend speaking with your surgeon. He or she knows the details of your procedure and can advise you accordingly after an exam. I hope this helps, and I wish you the best of luck. 

I would say it is highly unlikely that you could have shifted your chin implant after falling asleep on it 6 weeks post op.  It would normally take a good amount of force to move a chin implant 6 weeks after it was placed and just sleeping on it should not produce enough force to move it.  If you feel there is any change in the appearance, you should be evaluated by your surgeon.  

Highly unlikely.  The pocket should be pretty well healed by now.  If it had shifted, you would see something abnormal.  I would not be concerened.