classic waka stream

At no set time
are such thoughts confined—yet still,
on autumn nights,
they reach their utmost depth,
with no end to pondering.

Meaning
Though there is no fixed time when one does not fall into thought, it is on autumn nights that such reflections reach their utmost depth.
Commentary
Book Four Autumn Poems (Part One)

This poem was paired in a poetry contest at the residence of Prince Koretada.

It expresses the act of reflection, suggesting that although such thoughts are not bound to any one season, it is on autumn nights that they deepen without limit.
The cause of these thoughts is not revealed, but they seem to be conceptually linked with the season of autumn.
Author
Unknown Poet
Source
Kokin Wakashu
Other