Saying there's some health benefit to it def crosses into Joe Rogan/Liverking territory, but there's a lot of historical and anthropological evidence that these types of sleep patterns were the norm in pre-industrial societies. It's something that's been documented across cultures from ancient Greek texts to anthropological studies of uncontacted tribes. The most interesting documentation of it is in court depositions from pre-industrial England, which offer some really interesting insights into what day-to-day life looked like in Europe before industrialization.
From what I understand, people weren't getting up to rise and grind after their first sleep, but would chill in their homes with their families, drink something warm, add oil to lamps or wood to fires, or just go to town on eachother.