Perhaps because my Little self is a preschooler, my night-time wear doesn't routinely include diapers. Instead, at this time of year, it's blanket sleepers, which *must* have a drop seat.
So, who else has sleepwear with a drop seat, and what does it get used for?
(For me, the "potty flap" gets used for three purposes: to use the potty, to gain access to my bottom to take my temperature, and to gain access to my bottom to give me a spanking. Luckily, the first purpose is used a lot more than the other two.)