Hibernation
Hibernation was an inactive condition resembling a deep sleep which some species enter for long periods of time.

In 2269, Captain James T. Kirk asked the Elysian Ruling Council not to hibernate the  for a star century as they planned because the  could not leave the Delta Triangle without the combined warp power of the Klothos. ()

Hibernating species 
 Antedian (self-induced catatonic state) ()
 Denobulan ()
 Grizzela ()
 Kohl settlement inhabitants (self-induced) ()
 Takaran (self-induced stasis) ()
 Voth (self-induced) ()
 Some species of Earth insects. ()

External link 
 

de:Winterschlaf
Physiology
Sleep