You finally lie down, ready to sleep - but suddenly your mind starts racing. Old conversations replay, future worries creep in, and random thoughts refuse to quiet down. If this sounds familiar, you are not alone. Experts say nighttime overthinking and insomnia are not random, but mostly driven by how your brain, body, and stress systems interact. “It usually happens because of a complex interaction between how we think, how our brain is wired, and how our body responds to stress,” said Dr. Radhika Manohar, Consultant – Neurology, Manipal Hospital.
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At night, a network in your brain called the default mode network becomes more active. It’s responsible for self-reflection and thinking about the past or future. In people with anxiety or stress, this system can spiral into rumination, causing repetitive negative thoughts and cognitive hyperarousal - a state where your brain is too alert to sleep.
“Some people, especially those with anxiety or low mood, suffer from this process wherein the internal mechanism becomes overactive,” said Dr. Manohar.
Normally, your body winds down at night. But in people with insomnia, the stress system, known as the HPA axis, remains active. According to Dr. Manohar, it keeps cortisol levels high, making your body feel like it’s still in “daytime” or under threat, even when you’re trying to rest. “This means cortisol, the main stress hormone, stays elevated at night when it should be low. This may feel like, even though you’re trying to sleep, the body considers either it’s daytime or under threat,” she said.
Good sleep depends on a balance of brain chemicals - GABA, which helps calm your brain, and dopamine and orexin that promote wakefulness. When this balance is disrupted, your brain struggles to switch off, leading to restlessness, racing thoughts, and poor sleep quality.
Lack of sleep affects your brain’s emotional regulation. The prefrontal cortex - decision-making center - becomes less effective, while the amygdala - emotional center- becomes overactive. This makes worries feel more intense and harder to control at night.
When brain chemicals go haywire, your brain struggles to switch off, leading to restlessness, racing thoughts, and poor sleep quality
Your gut health also plays a surprising role. Changes in gut bacteria can trigger inflammation, which sends signals to the brain and disrupts sleep. This link explains why poor digestion and insomnia often go hand in hand. “At the same time, the wake-promoting chemicals like dopamine and orexin may stay elevated, and the brain’s alert system, which is driven by norepinephrine, remains active. All of these factors cause the brain to stay in alert mode when it should be in rest mode,” said Dr. Manohar.
Several everyday habits can make nighttime anxiety worse:
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