For Brad Johnson, a seventy year old from Providence, Utah, a productive day begins after only five hours of shut eye. While most adults are urged to aim for seven or more hours to remain healthy, Johnson thrives on a fraction of that amount, remaining sharp even after grueling international travel. To the casual observer, this looks like chronic sleep deprivation, but Johnson belongs to an elite and rare group known as natural short sleepers. These individuals possess a biological requirement for sleep that is significantly lower than the general population, often waking up feeling fully restored without the aid of caffeine or alarm clocks.

This unusual ability is rooted in genetics rather than willpower. Researchers, including neurology professor Ying Hui Fu at the University of California, San Francisco, have identified specific genetic mutations in genes such as ADRB1 and DEC2 that regulate sleep and wake cycles. Unlike those who simply force themselves to stay awake, true natural short sleepers maintain their brief routines even on vacation. Scientists believe these outliers hold the key to understanding how the brain calculates its need for rest and whether certain people can complete essential neurological maintenance more efficiently than others.

However, experts warn against confusing being a natural short sleeper with being a habitual short sleeper. Many people claim they can function on four or five hours of sleep, but they are often masking exhaustion with stimulants or have simply forgotten what true alertness feels like. Professor Elizabeth B Klerman of Harvard Medical School notes that humans are notoriously poor judges of their own sleep needs. For those who aren’t genetically predisposed to short sleep, chronically cutting hours leads to significant health risks, including increased rates of obesity, diabetes, and coronary heart disease.

The overarching mystery remains why some brains require less downtime to reset. One leading theory suggests that natural short sleepers might experience deeper slow wave sleep, allowing their synapses to recover faster than average. Despite centuries of observation across almost every animal species, the exact mechanism that triggers sleepiness remains elusive. By studying those who need very little of it, researchers hope to eventually decode the fundamental essence of why we sleep and how we might optimize our own cognitive health.

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