According to the Quickdraw Mixology Webisode Special, where they gave the recipe of a genuine drink of the 1800's, this episode you had to drink a sip of Sleeper every time someone mentioned the word "Younger".
The recipe to Sleeper is: gill (4 oz.) old rum, 1 oz. sugar, 2 egg yolks, juice of 1/2 lemon, 1/2 pint boiling water, 6 cloves, 6 coriander seeds, cinnamon, whisk. Strain in a tumbler.