The allergist/immunologist wanted to put difficult child on a pulsox overnight to see if he's desatting. We were setting it up and familiarizing him with it. He was trying to put it on himself, and I noticed, while he was attaching the arm band, which he had to really concentrate to do, his sats went down to 90%. Anytime he concentrated on something in the short time he had it on, the sats hung right around 90%. If he was just piddling around or being "normal", it was 98-100%. No idea if it means anything or not, but I thought it was interesting and I'm going to pass it on to his doctor.