“Why the heck would a 16 yo be asleep in the middle of the day?”
You obviously don’t have teenagers. They do seem to need a good amount of sleep. My teen balked about naps when he was little... he now takes them when he can (minus the stuffed bear, of course)
Parent will either control the kid or the kid will control the parent, the choice belongs to the parent. There is no middle ground.
Yes raised teens and neither were permitted to sleep in my house in mid day, but then again I was not trying to be “friends” with children I was charged with turning into stable productive adults.