He was sleeping on the switch

On a Pittsburgh sports radio call-in show called The Fan, Ron Cook (an excellent Pittsburgh Post Gazette Sports writer and sports show commentator) hung up on a caller who did not answer in time.   He then said the caller was “sleeping on the switch”.   This is a congruent conflation of “asleep at the switch” and “sleeping on the job”, both meaning to be inattentive.  “Asleep at the wheel” might also be in play, but I doubt it as the mix up is with the prepositions “at” and “on”.  A big thanks to John Kooser who was certainly not sleeping on the switch when he heard this one.