A small something I noticed that might be a result of neurofeedback: After my 2nd session last Wednesday, I would wake up every morning, and while still in bed I would feel compelled to stretch myself, which I did for a few seconds, those long well-feeling stretches that put a smile on the face, and ready me to start the day in a good mood. I didn't realize it until I started doing it again, that I haven't stretched like that in bed upon awakening, for a very long time.
This morning (4 days after the NF), I woke up in a less well-feeling mood without the compulsion to stretch. I did it anyway, but it did not feel as spontaneous as the previous days, and it took me a few hours to get out of the grumpy/sleepy mood and feel fully awake. It's as if the good results of NF are waning over time, as others mentioned, and that's probably why the practitioners often recommend it done twice a week. I can only do once now though, so we will see after the next session.