I have Celiac and a sleep disorder (hypopneas, periods of reduced breathing, rather than apneas, but which are just as bad). I think having an untreated sleep disorder puts the body and nervous system under a lot of stress. In my mind I wonder if its part of the reason I developed Celiac - from stress, which was potentially exacerbated or caused by my untreated sleep disorder. I have probably have had the sleep disorder since my teen years (now 27), because we think its due to having a large tongue and a very narrow jaw space, but not sure when I developed/triggered Celiac (I got a very bad case of eczema, tested negative for DH, which got worse and prompted the Celiac tests when I was 26) - I could've developed it last year or it could have been happening for several years or more. Its hard to say because I have no gut reaction to ingesting gluten - I don't feel anything or get sick.
Anyway, its interesting to think about the connections, but hard to say for sure! I don't think going gluten-free will help my sleep disorder at all, since its not so much about inflammation in my throat but just not enough room for my tongue.