Doing a search for "mcas sleep apnea" on google this was posted on the first result page:
"Sleep apnea, almost always obstructive, is found in 15% of MCAS patients and curiously occurs not uncommonly in non-obese patients [I'm not obese], raising questions of mechanisms which might include airways narrowed by edema, hypertrophy, fibrosis, or excessive mucus, or excessive loss of airway muscular tone in sleep."
I took a sleep apnea (at home) test about 5 years ago and...
Sleep apnea, MCAS, sleeping in an upright position.
"Sleep apnea, almost always obstructive, is found in 15% of MCAS patients and curiously occurs not uncommonly in non-obese patients [I'm not obese], raising questions of mechanisms which might include airways narrowed by edema, hypertrophy, fibrosis, or excessive mucus, or excessive loss of airway muscular tone in sleep."
I took a sleep apnea (at home) test about 5 years ago and...
Sleep apnea, MCAS, sleeping in an upright position.