Source : Webster's Revised Unabridged Dictionary (1913)

Sleeping \Sleep"ing\,
   a. & n. from {Sleep}.

   {Sleeping car}, a railway car or carrriage, arranged with
      apartments and berths for sleeping.

   {Sleeping partner} (Com.), a dormant partner. See under
      {Dormant}.

   {Sleeping table} (Mining), a stationary inclined platform on
      which pulverized ore is washed; a kind of buddle.

Source : WordNet®

sleeping partner
     n : a partner (who usually provides capital) whose association
         with the enterprise is not public knowledge [syn: {silent
         partner}]