I do this! About once every three days i get up in the middle of the night, eat a meal, read a bit, maybe get a shower, then go back to sleep for 2-4 hours. I call them "night days"
same, haven't done so for a while, but when I do, they are very agreeable.
Over the past couple of years I have to "nap" for at least 4-6 hours. It's probably related to fatigue from diabetes, so I don't want to disregard the underlying cause. That said, I don't fight it. I've have a lifestyle that lets me sleep when I want rather than suffer through the exhaustion.