While it’s easy to describe in vague terms like this, the two-process model of sleep “consists of mathematical equations with a precise meaning,” write the researchers – and that “means it has ...

The 2PM explains how our sleep patterns are shaped by two factors—a pressure to sleep that builds the longer we are awake and diminishes during sleep, and the near 24-hour rhythm of our internal body ...

Surrey's research team used math to show how the 2PM reflects what happens in the brain as people switch between sleep and wakefulness. They showed that the 2PM helps explain why babies at some ...