I gather from the response that not many are doing or interested in doing deep breathing exercises to lower blood pressure for sure and probably improve sleep. I've suggested deep breathing to other people I know and invariably they look past my ear and wonder how much longer I'm going to drone on! My philosophical self shrugs knowing that it certainly works for me: this morning's blood pressure dropped 15 points after I did 40 478 breathing cycles and that put my blood pressure into the low 130s. Diastolic dropped and so did my pulse. I'm thinking about cutting down my bp med dosage. I can't measure what it's doing, if anything, and if my bp goes up in spite of my deep breathing, I can then assume that the bp med is doing something albeit in a black box.