Perhaps it wasn’t mass hysteria. It is possible that some presence was indeed hovering over the little girls. A spooky, evil entity with disgusting motives at hand, eerily waiting to make his move - one of the girl’s brothers, peering into the room, hoping to get a glimpse of teen girls in scanty pajamas.
I recall a 14th birthday party sleepover where we caught the little bugger (birthday girl’s 13-year-old brother) peering from the kitchen into the living room where the girls were all sleeping. Sure enough, when we flipped the lights on, the kid had his hand in his pants. We all screamed bloody murder. The mom came rushing in, and much embarrassment ensued for the poor, humiliated, hormonally ravaged, pimply little brother.
Hopefully it was just some little brother with crazed hormones peering in, curious as to what the girls looked like in their summer pajamas. Worst case scenario, it could have been some creepy youth counselor or neighbor - yikes!