I nap whenever I both want to do it, and can do it. Since the first child, I gained newfound appreciation for sleep time. These last couple of weeks I’ve been taking a quick nap in-between dropping the youngest at daycare and starting my work day lol
The key to feeling refreshed is keeping them extremely short (think about 15 minutes tops), you need to wake up before hitting deep sleep or you have to wait for your next REM cycle to be over. It’s admittedly pretty problematic when you have trouble falling asleep. My wife has this problem too, and she’s a light sleeper on top, so naps don’t work well for her. If I lay down for sleep, it happens in a matter of minutes, so a 15-20 minute power nap is easy and very efficient.