Problem(s) Encountered:

Shortly after 01:00, the CCD stopped taking data.  Owl error messages included  Not connected to any controller! 

Various attempts to restart Owl or the controller were unsuccessful.

Solution:

Tried the usual button pushing on the Owl GUI from home before resigning myself to a morning trip to the mountain.  Power cycled the CCD controller but problem persisted.  Removed and reseated fiber connections (both at controller and PC).  This corrected the problem.