However, this article does highlight the importance and naturalness of a mid-day nap. When reading this I started practising mid-day naps at my desk, but I never really learned to do it until other things got in the way and I started forgetting about it. Maybe I should try again.
At the very least, I encourage anyone to stand up for the right to take a mid-day nap, even if you don't personally use that right.
If you feel like you could use a nap, napping is probably the responsible thing to do. If we defend that position with evidence, maybe we can slowly change the culture at work to not look down upon it.