What's an effective way to stop sleep talking?

A sleep apnea device: Sleep talking is one of the 'parasomnias' identified as part of a sleep disorder. A simple oral appliance may be all that is necessary to inhibit this common disorder. See a dentist that is trained in sleep disorders to treat this simple problem.

See sleep MD: There is no dental devise for sleep talking. There is one for obstructive sleep apnea. Sleep talking needs to be evaluated and treated by a sleep specialist.

Alter sleep level: Sleep talking is a 'parasomnia', along with abnormal movements, emotions (nightmares), dreams, etc. These occur during certain levels of sleep. Altering the level of sleep can occur with the use of an oral sleep device. However, the oral appliance is not intended to prevent speech...Just alter the level of consciousness associated with sleep.

Somniloquy: Sleep talking is usually a benign disorder of arousal (parasomnia). It usually occurs during non-rem sleep but may occur during rem sleep. In some cases, sleep talking may be secondary to other disorders such as rem related behavior disorders in which people act out their dreams.. Usually no treatment is needed but in some cases treatments to decrease arousals are helpful.