After a shower in the morning, of course! But at night..... uh... no? Why would I want that stuff rubbed all over my sheets? If I'm sweating so much I stink in my bed after a shower, I obviously have too many blankets on.

You're supposed to put on deodorant BEFORE you start to stink. It's a preventative, not a 'fix'. But before bed? My grandma never used deoderants, she used baby powder or other scented talc products instead, and after bathing. She's dead now, or I'd ask her if she used those before bed as well. Of course, I imagine for those growing up without the comforts of air conditioning in the summer, putting on something like that before bed WAS a preventative and needed thing. Eh.