On the booze: Alcohol's effects on memory are indeed severe, but mostly at high doses and with chronic consumption. Also, this is very individual and varys from person to person, as most things in bio do[0]. Additionally, OP mentioned that they want to stay sharp, and alcohol does have a positive effect on creativity in low doses, something we all know in coding[1]. In the end, OP should trust themself and drink as deemed appropriate (check with a Doc of course).
Sleep though, yeah, try to get more of that. Exercise too. Oh, also eat right. Hmm,... maybe should lawyer up and quit FB too, or so I am told... :P
[0]https://en.wikipedia.org/wiki/Effects_of_alcohol_on_memory
[1]https://xkcd.com/323/