Hibernation

       "type" : "mutation",
       "id" : "HIBERNATE",
       "name" : "Hibernation",
       "points" : 3,
       "description" : "You've developed the ability to stockpile calories and then sleep for extended periods of time.",
       "valid" : false,
       "prereqs" : ["HEAVYSLEEPER2"],
       "prereqs2" : ["FAT"],
       "threshreq" : ["THRESH_URSINE"],
       "category" : ["MUTCAT_URSINE"],
       "active"     :    true,
       "cost"       :    0