LOL the stay in the day thing confused me for a long time too.
For me it's more than 'just related to the drinking part' although it helps me to stay sober to be realistic about my goals and not stress...
but I've always worried about 'stuff'...I've had to let a lot of things go and only focus on what I can do *today*...
I think preparing for an interview next week comes under that heading...but worrying about it, or obsessing over it doesn't LOL.
D