Night sweats
My DR just talked to me about this when I mentioned my lack of energy during the day (at my clinic appt this past Wed). He said to see if I am waking up sweating, that is a sign your body thinks it is "exercising" while you sleep. Which could be from lack of O2, body digesting food, or if you do a treatment before bed, your body clearing it out and coughing in your sleep. I only wake up drenched if I sleep in shorts and my bare legs touch. SO weird!
I would mention it to your dr. Put in a call and see if maybe they can give you a sleep test or something. Hopefully it gets figured out for ya!