Abstract: Sleep mouthpieces are provided. One such mouthpiece includes an intraoral component including first and second troughs configured to receive a user's upper and lower teeth or ridges. The troughs are separated by a distance, thereby providing an opening that can allow mouth breathing. The mouthpiece includes an extraoral component connected to the intraoral component by first and second columns. The columns can be positioned at first and second ends of the intraoral component. The columns can also be positioned at first and second ends of the opening. The columns can also be positioned between the ends of the opening and the ends of the intraoral component. The extraoral component includes first and second retention portions extending from the first and second columns away from a center of the intraoral component and away from the opening. The first and second retention portions are configured to contact the user's face.