Popsugar Entertainment Tv Timeline of the Night Alison Disappears Pretty Little Liars Pretty Little Liars: A Timeline of the Night Ali Disappears August 3, 2015 by Sundi Rose View On One Page Photo 8 of 21 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 8 That Night: The Sleepover Alison and the liars spend the night at Spencer's family's barn. Allison arrives late, scaring the bejesus out of them — because she enjoys their fear. She drugs the other girls (maybe to see if any of them are "A") and leaves when they all pass out. Little does Alison know, however, Spencer woke up early and realized she was gone. Previous Next Start Slideshow Pretty Little LiarsTV