Does anyone know why a Praying Mantis would sit on a window screen for two days without seeming to eat as the weather gets colder?

I thought it was dead and so I tried to nudge it. It moved slightly but when I left, it went right back to the same spot on the screen. I figured with the nights getting cold it would go to a tree or bush or even the ground. I haven’t seen any bugs out since the temperature dropped.

We are going on day three and I began to wonder if maybe its something they do before they die. It is pretty large so I imagine it is an adult.
I’ve always known they could be slow but I think this is a new record.
If you have a real answer to the mystery, than great. If you just want to have fun with it, I’m good with that as well.
I just wonder how long can it stay in one spot. Seems strange.