As always, context is key. I seem to remember this BBC article discussing it as a sleep tool used generations ago.

It would appear that humans in winter months - when there are fewer hours of daylight - seem to favour splitting into two shorter sleeps with a productive waking period in the middle, where people are now encouraged to do a task (read, do the dishwasher, load the dryer, whatever) before returning to sleep.

It doesn't quite fit my setup there but there are some interesting points raised.