I ran errands and ate a simply enormous cheese blintz. The Beloved Englishman is digging up some RF shielding material from his workshop so I can sew a protective pouch for my medication pump. This will tell us once and for all if the problem is RF interference or not.
Hypothesis: the CPAP machine was part of the problem, but there is some other source of RF as well. But only in bedroom at night 🙄