[Nyororin]

Some Japanese kindergartens and preschools have a nap time. Summer is considered an important time for napping, so summer classes (Optional classes offered during summer vacation) in kindergarten/preschool and elementary school also often offer a nap time - even if it is not part of the regular school schedule outside of summer.

It does seem to be fairly common for middle/high school students to take a short nap (half an hour or so) after getting home from school before doing whatever. It is strongly encouraged by the middle schools in this area as a way of refreshing yourself before you move on to doing homework and studying.