Halloween hangover
n.— «The days after the biggest candy holiday in America are often considered some of the worst days of the year because of what’s known as the “Halloween Hangover.” Every Halloween, trick-or-treaters collect billions of dollars worth of candy corn, chocolate, licorice, gum…you name it. And many of the little super heroes and fairy princesses will be on a sugar high from eating extra candy during the week» —“Avoiding the Halloween Hangover” by Connie Thompson KOMO-TV (Seattle, Washington) Nov. 1, 2006. (source: Double-Tongued Dictionary)