A dental oral appliance for use with patients who suffer with sleep disorders, to reduce or eliminate snoring or obstructive sleep apnea and to open the airway for a sleeping patient. Retention for the appliance is provided by an occlusal coverage of the upper or lower teeth. A raised incisor ramp that extends from the incisal tip of the incisors toward the lingual, or posterior ramps, separate the posterior teeth to open the airway. A transpalatal member, which extends from the lingual of the right molars to the lingual of the left molars, inhibits the upward and backward movement of the tongue. The transpalatal member may be curved and may slidably fit in the body of the appliance. A posterior tongue restrainer may be attached to the transpalatal member.