Hi @A-Z,
I only have an exceptionally anecdotal contribution regarding memory. I don't know how much it may be related to CH, but I considered my memory to be 'bad' until getting on Phosphatidyl Serine (which is touted for memory) years ago. I've been on and off it a few times since, and whenever I go off I notice the memory slipping again. Feeling very fortunate that the memory is significantly improved, though certainly not so miraculously much that it could be described as stellar - I know I've displayed some glaring lapses right here on this forum.
I think there was just maybe a sideways kind of response to your question about mood. Some of us don't know if depression is related to CH, because busting has had the welcome side effect of lifting our moods, and with continued maintenance busting, this mood lifting can potentially go on for years! Count me as one. There have been a lot of CH'ers here struggling with depression though. I don't know if it is a higher percentage than John Q Public, or maybe a correlation has been made that I once knew of but have FORGOTTEN! OOF!
I personally like the meditation action (or inacation? ). Just recently there has been more discussion here about the Wimhof breathing method, and I notice he says it goes really well with meditation. I tried it a bit last last night, and intend to try it some more. The really dumb thing is I can't pursue meditation when in a full on cycle though - it's a hellacious trigger for me, just like naps, night time sleep, and most anything else relaxing!