You may want to have that checked. I had sleep apnea that use to suck up my stomach acid and made for a very bad wakeup in the middle of the night.
Funny you should mention it, as I was diagnosed with severe sleep apnea a handful of years ago. Sensibly, I did nothing, and now it seems to have gotten worse. I have a new sleep study scheduled in a month or so.
Not to derail this wonderful thread, but are you on CPAP? I couldn't stand the full face masks. I hear the new nasal pillows are better, but I need to deal with my congestion. Woe is me.
I'm also not entirely sure how apnea leads to these night horrors (I've had them as well), but I've seen it mentioned elsewhere.