His short-term memory vanishes, and he weeps uncontrollably. The last days are marked by hallucinations: bears, wolves and aliens prowl the roadside; asphalt cracks rearrange themselves into coded messages. Occasionally, Robic leaps from his bike to square off with shadowy figures that turn out to be mailboxes.
This is just insane (no pun intended).  Listen here and read here about an athlete that quite literally goes insane during races and is allowed only to make choices for what music he listens to.  His crew decides all the rest - when he sleeps, eats, stops and rides.  Wowzers.