because when my E is higher, I don’t sleep as easily and prog helps counter that effect; when E is low I don’t need it for sleep, allowing me to stockpile the extra.

To a lesser extent, I like the idea of cycling because cis bodies tend to have fluctuating levels as well, and that may or may not help keep my body sensitive to prog, by keeping from homeostasis happening in whatever ways that may or may not happen, such as number of receptors adjusting to a regular level of the hormones if you don’t cycle.

It’s just speculation that this helps, and the stockpiling so I have a reserve in case of supply chain problems is a more straightforward reason for me.