A potion of great strength, it is a finely brewed tea that restores Constitution, as well as gives the drinker an unusual burst of Strength, due to the high levels of caffine. Tastes great chilled and with a drop of honey and lemon.
Except, it doesn't have to be. Nighttime can be a relaxing, peaceful time in the world, when nature rests and soft shadows cover the ground. Not every night has to be filled with vampires, ghosts, beasts, and things jumping out from dark places.