well.....in the 60s, kindergarten was only half days, 3.5 hours and all I recall is the naps.
In oregon , they think so, can't find the info, but kindergarten was not introduced until this century. Unless we used catholic school kindergarten as daycare, nah,, son would have gone to day care sitter that he had in Elementary school.
so private business should rent churches to make sure that a 5 year old gets a good nap, which is very profitable, all the staff cant take breaks during nap time, after all, in this covid era, what 4 years old did not nap for 2 hours or more?