The source provides an overview of ten books that capture the spirit and aesthetic of the Y2K sleepover era, generally spanning from 1998 to 2003. This cultural period is described as a blend of pop culture obsession, early internet experiences, and unfiltered teenage energy. The author introduces the nostalgic elements of a typical Y2K sleepover, such as boomboxes, lava lamps, and teen magazines, to set the context for the reading list. Each book, including popular titles like The Princess Diaries and Gossip Girl, is presented with a brief summary and an explanation of how it embodies the themes of the time, such as friendship, transformation, identity struggles, and the rise of teen drama. Finally, the text offers suggestions for recreating the Y2K sleepover atmosphere, complete with specific snacks, activities, and music.