Hi, @carmella6 – I would like to add my welcome to Connect along with @lisalucier and other members. I have not experienced memory loss from using a CPAP machine but I have learned that severe sleep apnea can cause memory loss.

If You Have Sleep Apnea, Your Memory May Decline Earlier in Life
-- https://health.clevelandclinic.org/if-you-have-sleep-apnea-your-memory-may-decline-earlier-in-life/