It was the "bedside" monitoring device that went off. The unit is so "idiot proof" that the only controls are the button to start the scan/transmit process and that elusive "silence" button. The unit is supposed to have a range of 150 ft.
It is a bummer that you are not doing as well. Before they put the new pacemaker in I had the same problem with stamina that you are having. It took me three times longer to do something as it did before. That is if I could do it at all. Things are now much better. Heck, I replaced one toilet today and Betty wants the other three replaced with the "Super Flushers" and I'll do those tomorrow. (I had a hard time replacing three perfectly good toilets just because one went to heck.)
I do hope you get to feeling better.