Lately, I've been experiencing a great 'internalization' of Aikido (if it can be called that)
Please, its just Lynn (I am no Sensei. Just an old man having fun.)
I too experience a great difference in my training and discipline when I have my head on straight (positive, calm, or even empty).
IMHO, its when the body, mind, and spirit are congruent that it is true internalization plus external manifestion. I look forward to a glimpse of that (but probably not this life time).