[Symptoms] 11 months into CPAP but brain fog persists (and returned)

[Sleeper49]

   

Hi, I've been trying to desperately figure out why my brain fog has returned after 11 months of CPAP. I started with AHI 21, and after 7 months, my AHI dropped to the range of 0.2 to 0.5 each night. Things seemed to be on the mend.

Recently, my brain fog started to return despite my AHI dropping to 0 on several nights. I also replaced my mask headgear and nasal pillow, but the brain fog persisted.

Hence, I am wondering if my flow limitation is the issue. From what I've checked of my past OSCAR data, the flow limitation hovers at 0.15 (95%) and 0.30 (99.5%).

Symptoms of brain fog in the day include forgetfulness, inability to hold more than 2-3 things in the mind at any point of time, and unable to recall key events that happened yesterday. At work, I have to repeatedly write down people's comments, lest I lose track of the thrust of the conversation. Some daytime sleepiness has returned too.

Any help would be appreciated! Attached a screenshot of a recent night's sleep.

[G. Szabo]

The best way to reduce the flow limit is to increase EPR and set it to 3. To fully benefit from this, you should also increase your minimum pressure to 7 cm. 
You should also turn the ramp off.