My Dad Is 72 Years Old, Takes Statins Along With

My Dad is 72 years old, takes statins along with other meds. He suddenly developed short term memory loss this morning. He doesn't know the date nor does he recall watching TV at the kitchen table with Mom. Thoughts?
ER dr suggested sleep apnea. I'm concerned about an unraptured cerebral aneurysm. A CT has been done, MRI will be done tomorrow. I'm in TX but my parents are in PA. Thank you!