Where are my SleepyHead Graphs?

I've been using my Respironics System One for five nights. After the first few nights, I had a bruise on the bridge of my nose and I switched to Respironics Nuance nasal pillows for the last two nights. They're much more comfortable.

I was using SleepyHead for my Pulse Oximeter (CMS50D+) for the past few weeks, and now I'm using it for both the APAP and the PulseOx. For the past two nights, some of the the SleepyHead graphs are missing.

In the Daily tab, for the first few nights, I can see:
Event Flags
Flow Rate
Pressure
Leak Rate
Snore
Resp. Rate
Tidal Volume
Minute Vent.
Insp. Time
Exp. Time
AHI

For the last two nights, I can now only see:
Event Flags
Pressure
Leak Rate
Snore
AHI

In the Overview tab, it says data missing for the past two nights for:
Resp. Rate
Tidal Volume
Minute Vent.

I'm using Windows 7. I downloaded the latest version of SleepyHead (0.9.6) and installed it to a new directory (folder). I re-imported the data into the new SleepyHead, but the data for those items still seems to be missing since I started on the nasal pillows.

Any thoughts about what's happening to the data? TIA.

Was the SD card in your PR S1 all night or was it still in your computer? or may be not quite correctly inserted?

The SD card must be in the PR S1 all night or there will be some missing data as the PR S1 doesn't store all the nightly files on its internal memory. SleepyHead needs the xxx.005 file for flow rate graphs along with some others and the PR S1 doesn't store xxx.005 files on it...
You can go into the P0 folder on the SD card and see the various file types.
xxx.001
xxx.002
xxx.005 and this file must be there for you to get the flow rate and other graphs that depend on it. The SD card must be in the PR S1 all night to have this file.

Thank you! That seems to be the solution. Last night I remembered to take the SD card out of the computer and put it in the machine. I have all the data now.