Irish mix everything with alcohol. We still have some irish coffee-liquor in the house, but I hardly ever drink so when I do I easily get inebriated and probably too much.
I'd rather stick with hashis to counter the wakefullness of coffee.
And those saying they don't do drugs:
Then you certainly shouldn't be drinking coffee. And melatonin: it's not gunna help; had it for years and it's all placebo.