'Fringe' Star John Noble Suffering from 'Sleeping Disorder'

7/25/2012 4:56 PM PDT

John Noble -- star of the FOX show "Fringe" -- is suffering from a sleeping disorder which has affected the production of the show ... TMZ has learned.

Sources connected to the production tell TMZ ... 63 year old Noble has "not been sleeping well" and it's taken a toll on the production of the show.

We're told ... earlier this week, producers decided to halt production on the show  for 2 weeks so John could get treatment for his condition. Production is currently scheduled to resume on August 7.