The Collaborative International Dictionary of English v.0.48:

Sleeping \Sleep"ing\,
   a. & n. from Sleep.
   [1913 Webster]

   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.
      [1913 Webster]