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Your Brain Wasn’t Designed to Be Awake After Midnight, Scientists Warn

October 19, 2025
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Your Brain Wasn’t Designed to Be Awake After Midnight, Scientists Warn
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If you’ve ever stared at the ceiling at 2 a.m., wondering why your brain suddenly feels like a dark, scary carnival, science may finally have an answer. A growing body of research suggests the human mind wasn’t built for the night shift. After midnight, our brains start working against us, tipping toward impulsivity, risky decisions, and intrusive thoughts that feel heavier than they do in daylight.

Harvard neurologist Elizabeth Klerman, one of the researchers behind the “Mind After Midnight” hypothesis, says the brain’s chemistry literally changes after hours. “There are millions of people who are awake in the middle of the night, and there’s fairly good evidence that their brain is not functioning as well as it does during the day,” she said in a 2022 interview. Her plea: study it further before exhaustion and biology team up to do more damage.

The theory centers on circadian rhythms, the body’s internal clock that regulates sleep, hormones, and mood. During the day, our brains are tuned for reward, cooperation, and focused thinking. After dark, those same systems switch to survival mode. We grow more alert to threats and more sensitive to negativity, an evolutionary holdover from when nighttime meant danger.

5 Common Sleep Tips That Might Be Making Your Insomnia Worse

The Human Mind Isn’t Built to Be Awake After Midnight, Scientists Say

That ancient wiring can have modern consequences. Researchers point out that people are more likely to binge-eat, relapse, or engage in self-destructive behavior late at night. One study found suicide risk triples between midnight and 6 a.m., when reasoning, inhibition, and impulse control are at their weakest. “Suicide, previously inconceivable, emerges as an escape from loneliness and pain,” the study’s authors wrote.

After midnight, the brain starts playing tricks. Scrolling through strangers’ lives, rage-buying things you don’t need, or arguing online all feed the same restless circuitry. Without sleep, emotions stretch thin, and perspective warps until the smallest thoughts feel enormous.

Researchers at Harvard and the Massachusetts General Research Institute say this line of study could change how we understand insomnia, substance use, and even shift work. For people who stay up by necessity—nurses, pilots, warehouse workers—their brains may be operating in a subtly altered state for hours at a time.

For now, the advice is simple: don’t trust your brain after midnight. Eat something, text a friend, go to bed. The mind may survive the dark, but it’s not really built to live there.

The post Your Brain Wasn’t Designed to Be Awake After Midnight, Scientists Warn appeared first on VICE.

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