yes, I've noticed that too. I can feel fine if I'm 3.5 and I'm resting. But if I'm moving about and I'm 3.5 I know about it. Also I can feel fine at 4.5 and other times I don't feel fine at all. My first hypo I walked into a wall and tested at 4.2. I definitely don't feel fine in the low 2's though no matter what I'm doing. One of my weird hypo symptoms when walking is I suddenly pull to the left when my sugar drops and I've walked into quite a few things like that, mostly whilst shopping... I've knocked things off shelves, etc. Also at times can't feel my feet on the ground either. I can be any level from 4.5 or below when I get these symptoms. I get the usual shakes, sweating, nausea, panic attack as well. But yes... I react different depending on what I'm doing I think.