I've been doing naps at work for the last year, since I started to try polyphasic sleep. Naps play an essential role in my polyphasic strategy. Those 30 minutes I spend sleeping after lunch save me some sleep hours during night. You can get some data points about naps and its importance in this book (which I recommend): https://www.amazon.co.uk/Sleep-Myth-Hours-Power-Recharge/dp/...