thanks for the extra info. I wonder, even if they could be created on a large scale, what about the damaged ones? the damage to my thalamus causes all kinds of autonomic problems. Wouldn't those old cells have to be disposed of as well as new ones being created.

And for a function like sleep, wouldn't the different brain parts have to learn how to communicate with each other correctly?

I guess that's why some say to focus on dealing with the symptoms if you're an old timer. New timers still have time to be great again.