Respironics does them on all the auto adjusting machines.
They sometimes scare people and think that the machine is responding to something but it's not.
Here's an example...the only real pressure increase was the one starting around 01:00..Looks like it probably started out as a routine test pressure probe and the machine sensed something it didn't like so it went upwards a bit.
Don't ask me why sometimes it does the test pressure probes and sometimes it doesn't..the best we can make of why is when you see the flat lines the machine may not want to rock the boat if the breathing is a bit irregular and the times you see the probes you are actually sleeping soundly. Makes no sense to me but that's seems to be what they do.
I don't have the flow rate graph on that report. The SD card might have been out of the machine (left in computer by mistake) and that's the one graph that the machine doesn't store in its internal memory.
