Getting in “the mood”

I need some advice. After having my son, I struggle with getting in the mood for sex, especially multiple sessions during the work week. My partner knows this but do not want to hear it. He feel like I am making excuses.

This morning, we got into an argument because I was not in the mood. We had sex the previous night and FYI I was dreaming about my aunt who passed away in August. It’s the only time I can talk with her (don’t judge me).

I feel like I am unable to satisfy or keep up with him. If the roll was reversed, what can I do can I do if his equipment was not ready (if you know what I mean). Am I being unreasonable?