General Guidelines for Setting Practice Aims and Learning Outcomes:

4. Furthermore, we must also respect
the after-effect of the Āsana practice,
as well as the after-action yet to come.
Here we must respect the travel from A to Z
and that Z seems to vary much more than A.
For example, there are generally fewer
variables with practice in the morning.
Whereas, with practice in the evening we are more
subject to the day’s effects and thus more variables.

The Viniyoga of Planning Principles Guidelines – Collected & Collated