I've noticed that when it gets toward the end for people (not necessarily the VERY end, but maybe the last month or so when they have started really going downhill) they will hold their arms upward once in awhile and then let them fall at their sides.
I've seen this a lot. My father-in-law did it, too. He would have his eyes closed and raise his arms in the air as if he were reaching up.
Is this some kind of strange reflex or something?