I been noting in sleepyhead the nights I had been drinking a bit (never really get hammered anymore) and it is mixed sometimes it's higher sometimes lower.
What I did notice is that when I drink I stay in one position longer, sometimes all night. Which without I am usually going from stomach to side to side through the night which has the biggest affect on AHI. So when I drink I stay in one position all night and if I fall asleep on my stomach my AHI goes down as apposed to my back it goes way up.
Just some observations.