Part 3/9:
Biphasic sleep, as Heather reveals, was once commonplace, a stark contrast to the single-block sleep most of us know today. This practice's roots can be traced back to historical texts, where references to "first sleep" and "second sleep" abound. For example, Roger ACD's book At Day's Close: Night in Times Past notes a case from 1699 where a nine-year-old girl, Jane Ralph, woke up from her first sleep. Such mentions stir curiosity about the cultural norms surrounding rest in pre-industrial societies.