VETERANS of dorm life are familiar with the “freshman 15,” the proverbial dozen-plus pounds that new college students pack on as they adjust to campus life.

After a week of Chips Ahoy!-foraging and stress-bingeing in darkened apartments, downtowners who finally caught a glimpse of themselves in the mirror after the lights went on realized that they had succumbed to a highly localized version: the “Sandy Five.”

“I can’t even talk about it — my jeans do not button,” said Emily Marnell, 31, a publicist who cited both boredom and anxiety as a reason she fell victim to odd, middle-school-kid cravings for junk food after her Gramercy Park apartment went dark.

“I went through Duane Reade and was grabbing Double Stuf Oreos, whole milk, Twix, Twizzlers, Sour Patch Kids,” she recalled in horror.