More QSR restaurants stay open late

With Americans working and partying later than ever, quick-service restaurants (QSRs) are responding to the midnight munchies with extended hours, and in some cases, throwing away the "closed"sign altogether.

Taco Bell, Wendy's and Burger King all have extended hours, and many McDonald's locations are open around-the-clock, QSRWeb reported.

The hours between 9 p.m. and midnight account for 7 percent of all QSR sales, and that has remained steady for the last three years, noted Harry Balzer, vice president of research firm The NPD Group. He told QSRWeb that 45 percent of late-night customers dubbed their purchases as supper, while 51 percent called it a snack, and 4 percent described it as another meal, such as a lunch break.