At first glance, I’d assume this has something to do with the (epileptic?) seizure Roberts suffered a few years ago. If true, this is monumentally bad news for the nation. Roberts’ health should have been thoroughly vetted by the Bush people, and Roberts himself should have considered his health outlook carefully before accepting the nomination.
Half the Justices are semi-comatose and require staff to sign their own names.
Dear Chief Justice Roberts...please don't retire until the first anniversary of your death.
Prior to his nomination, he had had 1 seizure (in 1993). There doesn't appear to have been a diagnosis of epilepsy (or similar) based on that single event that occurred over a decade prior.