Whether your issue is snoring, sleep apnoea or EDS, opting for a mouth splint may help to relieve the symptoms during rest. However, in many cases, there are other things that contribute to sleep disorders, and you may be able to seek help to tackle those issues whilst using your mouth splint.
For example, many find that their lifestyle impacts their quality of sleep, and often making small changes can have a dramatic impact. In these cases, you may be able to stop using your mouth splint eventually as the issue resolves itself.
The good thing is that you can use it, or not use it, as and when you choose.