Interesting. Yeah, I think it is related to fasting stress response, and energy conservation mechanisms, as GH spikes in a fasted state to optimize fat oxidation for energy as opposed to muscle cells, but the body also wants to avoid excess fuel consumption in this conditions, at least from an evolutionary biology perspective. GHRPs trigger the same "environment", but at least what I've read is that ipamorelin is much "cleaner" than the others in that it has far few lesser impacts on the other receptors involved. But I guess nothing is absolute in hormone feedback loops. Interesting stuff.
Did you FEEL the prolactin surge? Or was it something you only noted based on labs?