Good point. I didn't provide context in my comment. Just trying to be helpful. The studies in the article show naps improve several factors like alertness. Anecdotally, many people either have a hard time falling asleep mid day or fall asleep for too long and wake up groggy. Non-Sleep Deep Rest (NSDR) has the same benefits of napping without the downsides. I believe there are studies on it, but I don't have references handy. Just speaking from personal experience.