The girls decide to investigate a local "haunted" house or legend as part of their sleepover activities [7, 9].
tries to convince Frankie he is old enough to stay home alone while she runs errands [1]. [S2E8] Sleepover
Mike Heck (the father) is heartbroken and angry when he overhears one of Sue's friends, Shannon, mocking her and intentionally not inviting Sue to a sleepover [2]. The girls decide to investigate a local "haunted"
If neither of the above is the show you are looking for, "Sleepover" is a common episode title in other series: [S2E8] Sleepover
In this episode, the second generation of the Sleepover Club (Charlie, Tayla, Maddy, Jess, and Brooke) deals with a spooky mystery [9].