4-Hour Sleepers Part 2: Overfunctioning and Underfunctioning

There's another part to the 4-hour sleeper puzzle I've come across over the years: overfunctioning.

There are, as they say, two kinds of people in the world: overfunctioners and underfunctioners. This is essentially a reaction to stress. Some people shut down under stress and feel sapped of energy. All movement is against the current.

Overfunctioners are …