I am 3 weeks and 4 days out from surgery and am doing nothing during the day to stress my sternum. I am sleeping on my sides at night and sometimes get the feeling that my sternum has popped or clicked a bit as I re-adjust my position. I have heard that this is normal, but I'd like to know how long into the healing process I should be feeling this - I understand that the sternum takes 4-6 weeks to heal completely so I am interested to know when you really feel that it is fused and how you know for sure?