[TheCapeGreek]

Yeah, oral appliances don't fix the actual problem: tongue slacking into the back of the throat. It's the same reason a chin strap will just make you choke.

Supposedly you can "train" your tongue to stay in position with tongue & jaw exercises, but I saw no effect.

[euroderf]

Oral appliance worked for me. It was sufficient to get my jaw in the right position.