Fisher Wallace and over stimulation

It's easy to remove those old files from the SD card.
Respironics machines put the data files into folders per serial number of the machine.
You just need to manually delete the older folder that has the different serial number on it. No big deal. Just removal of that one folder will fix it.

You will need to create a new user profile in SleepyHead though (you can delete the old profile by going to MyDocuments and going into the SleepyHead folder where the profiles are shown and delete the old profile that has the other person's data).