As a former football player who has carried a football more than 4 000 times trust me I did not go into ballroom dancing with my body being 100 percent with no aches or pains or ailments coming with me. When you're dancing you're doing stuff that your body's not used to and so you start to aggravate those old injuries.
The dissemination of advanced implantable technology will likely be just as ruthlessly democratic as the ailments it is destined to treat. Meaning that someday soon we may have a new class of very smart very fast people - yesterday's disabled and elderly.
Cats are rather delicate creatures and they are subject to a good many different ailments but I have never heard of one who suffered from insomnia.
It has become part of the accepted wisdom to say that the twentieth century was the century of physics and the twenty-first century will be the century of biology.