Sure. I tried a bunch of things at once, with the purpose of feeling and thinking better. Collectively, they worked. However, this means that I have probably just acquired a bunch of ungrounded superstitions.

I've recorded what I did but haven't learned anything from that data other than: I am unlikely to ever continue a daily practice of either napping or meditating.

I would speculate that dual n-back is a repetitive and simple enough* stimulus that it's likely to offer whatever "self-awareness" benefits I felt in meditating.

• it's simple in coarse physical terms; obviously the actual sequences are randomly varied