Although this isn't a proper setting to provide consultation and I have to remind you that a trained physician in sleep medicine in a sleep laboratory setting could be more specific on answerimg your question, here are my thoughts.

Are there any signs of gastroesophageal reflux? Like burping, or feeling hearburn, maybe even non-cardial chest pain? If so, I would suggest consulting with a gastroenterologist before visiting a sleep laboratory. GERD (gastroesophageal reflux disease) is often associated with late sleep on-set phenomena and with fragmented sleep circle pattern due to central apneas taking place when the acidic reflux enters the esophagus.

If you already have ben checked by a gastroenterologist (and/or are under treatment) I would suggest visiting a sleep laboratory. They would perform a sleep study and will be able to better assess your sleep patterns.