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I have the same problem as dzwiss. I use ResMed S9 and SleepyHead. I noticed the time setting was wrong on the ResMed equipment a couple of months ago and manually changed the time setting on the ResMed. Since then whenever I upload new results, some of the older AHI results nearly double. The Tool "Rebuild CPAP Data" works, but I have had to rebuild the data repeatedly - this fix works only until the next time I upload new results. There is a time change at 2:00 am tomorrow (3-13-16) to daylight savings time and I think this problem will only get worse. Is there any permanent fix?
Do you still have all your data on the SD card? If so, you can rename the SleepyHeadData-Testing folder and let Sleepyhead create a new one. Then do an Import. If that fails, you still have the old one to rename back to original.
Using FlashAir W-03 SD card in machine. Access through wifi with FlashPAP or Sleep Master utilities.
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OK. I understand. I'd rather not mess with the backup folder because it is functioning properly as is. I have used it at least six times to restore and it works well.
I think the problem arises when you manually change the date in the ResMed device (which I did because of the change to (and from) Daylight Savings Time). The ResMed then REWRITES data to the SD card for sessions on the card with the same date, but different time of day. It's the same data, but I think SleepyHead thinks it is new data for those days - and therefore CHANGES the data for some of those days - almost doubling the AHIs for certain days - just exactly what dzwiss pointed out. This is fixable - by restoring the correct data in the backup folder - which thankfully does not change.
I'm not sure how many sessions are affected. When I put a new, blank card into the ResMed, it seems to put the last week or two of data onto the new card.
I think this is a potential flaw in the software which hopefully could be addressed. This is avoided altogether by NOT CHANGING THE SYSTEM TIME in the ResMed device. However, during Daylight Savings Time, the sessions shown in SleepyHead will appear to be "off" an hour from "real" time. The problem is compounded if you are also trying to merge data from another device, such as an oxygen saturation monitor.
I want to thank you for your help and appreciate your guidance. If you agree that this is a potential flaw in the software, is this something that you could report on my behalf?