I have a similar thing going since a few years. Go to work for 8 hours. Come home and sleep on the couch for 3 to 4 hours, followed by another 4 to 6 hour period of hacking. I feel like I totally understand the concept of fiesta since I started this routine. However, during lockdown, as you have already indicated, things started to drift because of the lack of commute, or in my case, because of the lack of the 5 minute walk to work.

TL;DR: Yeah, powernapping is a thing.