I shower in the morning and at night.

If I shower in the morning I am most likely getting ready to go out somewhere. So of course I will apply some deodorant.

If I shower in the evening it is most likely just because I want to or maybe I needed to after a long day. I would only use the deodorant afterward if I was going over to a friend's that night / seeing someone.
Otherwise no, I don't see much point to it. Especially if I am just changing into my PJs after.