If I'm hungry, yes. I don't really understand this rule. Don't some European countries routinely eat that late? I had a friend from France who was throwing a dinner party late in the evening and was shocked to find most of her guests had eaten before they came.
I don't normally eat after 9 pm, unless I've had a really light or early dinner and am really hungry afterwards, then I'll snack on a few cookies around 11 pm; I don't want to starve for the rest of the night since I stay up till 4 or 5 am.
Sometimes, I only get around to dinner around 9:00 p.m. thanks to my work schedule, so yeah. And I snack sometimes. I love my midnight snacks. I don't know, I think you can counteract the inactivity of eating that late, by eating healthily and exercising regularly. I don't see the issue.