Absolutely! Do you have a happy, productive workplace, or are you running a sweatshop? It's all part of the equation. Who naps, how often do they nap, when do they nap, all these things are signals that tell you what's going on in your team. In Europe they have the phrase "soup coma". It's what happens after lunch when the blood sugar level rises and the insulin kicks in and shuts off the brain. Expect it, and work with it, as the company in that article did.