An editorial Sunday declared without explanation that Japan's post-World War II experiment with daylight time, imposed by U.S. occupation authorities, was abandoned when the Japanese regained their sovereignty. The Japanese Embassy's Information and Culture Center now offers the following, printed here in its entirety.

From 1948 until 1951 Japan practiced Daylight Savings Time. From April to September there was a summer time schedule of an additional hour of sunlight. This system was abolished because of the following reasons:

1. The sun set too late. An additional meal was required because the day was so long.

2. Longer hours for laborers.

3. Lack of sleep.

More information is available upon request.