SPLIT Night's sleep - waking

I wake up about 3 hours I to a good night's sleep.

The first part of the night feels good and generates pretty good numbers. AHI 0.9 to 2.5.

After I go back to sleep, my esults get all screwed up. The end of the night results end up average to over 9 almost all the time.

As I suspected, the second half of the night, by it's own numbers is pretty bad.

I accidentally left the SD CARD out of the machine last night. I only realized it after I woke after 3 hours! I put the drive back in to see what the date results. As I thought, the card only captured date from the period while the card was in.

Interestingly, this answered the question about the split night data.

The data from 3:00 am on was horrible. Read out on OSCAR. Most of my CA events happened here. Some HA events, too. But worst of all, the AHI jumped to 22.9!!! Interestingly, MyAir showed 2.1 for the first half, 9.1 for the second half (total time on session.)

Any ideas what is happeming! It is getting pretty annoying having every night like this.

P.S. Thanks to the commemts on the earlier post about this.. I can't fi d it to append or reference. Sorry