Mouthpiece having elevated contact features

An oral appliance, comprising:

• an upper body including an arcuate upper body base joining a maxillary labial wall and a maxillary lingual wall in spaced apart relation defining an upper body channel between opposing inner wall surfaces, said upper body channel having an upper dentition impression which matingly receives maxillary teeth of an upper dental arch, said arcuate upper body base having an upper body base outer surface, all of said upper body base outer surface essentially entirely flat;
• a lower body including an arcuate lower body base joining a mandibular labial wall and a mandibular lingual wall in spaced apart relation defining a lower body channel between opposing inner wall surfaces, said lower body channel having a lower dentition impression which matingly receives mandibular teeth of a lower dental arch;
• and
• at least one node disposed on a lower body base outer surface, said at least one node disposed to engage said generally flat upper body outer surface upon receipt of said maxillary teeth of an upper dental arch in said upper body channel and receipt of said mandibular teeth of a lower dental arch in said lower body channel.