Many thanks to apneawho, Pugsy and KEQ5 for your informative replies. After studying my graphs, I see that my maximum pressure is indeed bumping along the 7cm mark for a lot of the night (previously set at 4.0 min-7.0 max) and EPR set to OFF. For tonight's journey into sleepsville, I have set the pr...

I have my ResMed S9 Autoset set between 4cm and 7cm. My next day's pressure graphs show that it stays at 4cm until an event occurs, when it rises to 7cm (and hopefully does its job). It will then drop to around the 6.2 - 6.6cm pressure (but never lower thereon). I need to turn the power off, then on...