National Sleepover Day is celebrated on May 9 and promotes the joy of spending time with friends in a cozy atmosphere, making memories and strengthening friendships. It was founded as a collaboration between bareMinerals, Cosmopolitan, Sephora, and influencer Olivia Culpo. Typical activities include hosting sleepovers for kids, where they can invite friends over for snacks and planned activities, or watching movies that feature sleepover scenes, such as "Grease," "Clueless," and "Mean Girls." The day encourages both girls and boys to engage in fun activities, whether it be sharing stories, trying out new hairstyles, or playing games. National Sleepover Day originated from a publicity stunt in Times Square, aiming to inspire people to host their own sleepovers.