I am not sure if it was Tales from the darkside, goosebumps or something else. But it was about a woman who always wore a ribbon around her neck, and someone took it off while she slept and her head fell off. I know it was an ghost story always told at sleepovers. But I thought it also was an episode of one of the show's listed above. Does anybody know?:)

The story is called "The Velvet Ribbon" by Anne McGovern.