Rest doesn't cure dementia. Doc Dutch recommends a handful of fentanyl and call me in the morning.
https://www.mayoclinic.org/diseases-conditions/dementia/symptoms-causes/syc-20352013
Actually, rest is the only hope with advanced Trumpism. The recommended course is an hour in a dark room contemplating lives damaged from personal loyalty (his co-defendants, Jan. 6 inmates, people who lent him money, etc), followed by extended bed rest.