The Collaborative International Dictionary of English v.0.48:

Psychopannychism \Psy"cho*pan"ny*chism\, n. [Psycho- + Gr. ? to
   spend all night long; pa^s, pa^n, all + ? night.] (Theol.)
   The doctrine that the soul falls asleep at death, and does
   not wake until the resurrection of the body. --
   Psy`cho*pan"ny*chism, n.
   [1913 Webster]