Maybe the level and quality of awareness with which you are doing the exercises is bringing your attention more and more to yourself?
Perhaps it's just messages that, hey, you need to slow down a little, rest, and take care of #1 every so often.
It might not necessarily be signs of ailment, rather it may be awareness of a condition that has existed for quite some time ... it's just that the level of quality of checking in hasn't been this good in the past. That is, maybe you just need some rest and this is the first time you've noticed.
That's just a guess.
