Alan, I have been using a CPAP for over 4 years. I, as you do, track my events, pressure, etc. every day and try to correlate it with something - diet, alcohol, degree of tiredness. So, my AHI and pressure needed is more when I am really tired, have a sweet dessert after dinner, or have foods high in sodium. If I eat a little earlier in the evening, this seems to mitigate the number of events. Maybe some of these variables would be related to you.