Process of elimination. Other than what’s been mentioned…

1. Does this happen when you’re staying over somewhere else or in a hotel for a few days? If not, may want to check for mold, bed bugs, or airborne particulates. Mold is usually odorless, but can grow behind walls and above ceilings.

2. Can you switch out into a fresh, new set of clothing and/or beddings, and use allergen-free detergents? It’s possible to develop allergies to certain fabrics and cleaning supplies.

3. Ask for a sleep study. Often it involves wearing a special watch continuously for a day or two, then turning it in. Sleep apnea can disrupt flow of oxygen to the brain. There are now ultra-quiet CPAP machines, with very discreet facemasks, so nobody has to be kept awake.