Hello, I am day 2ish with my CPAP machine. My husband noticed that I am less confused. lol. He is very supportive. My question is" what does AHI mean? I still feel headachy. I am only getting used to my mask etc. So far, I enjoy the fresh air and humidification from the machine. Waking up without dry lips and mouth. I am keeping a diary to help me focus on sleep goals ;as I have horrible sleep routines. Husband retired a yr ago. 
. Thank you.