"Getting up in the morning requires a tremendous effort," she says. "a lot of people with ADHD have trouble shutting down at night-their brains are so overactive they can't sleep."

很多人早晨起床可能要花费大力气，那些患有多动症的人在晚上很难快速平定下来，他们的大脑过度兴奋，无法进入睡眠。

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They added that in people with PTSD, the right hemisphere was overactive even when individuals were not reliving a traumatic experience.

他们补充说，即使PTSD患者本人并没有回忆受创伤的经历，他们大脑的右半球仍过度活跃。

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An overactive thyroid creates so much static, it's hard for the brain's messages to get through, while a sluggish thyroid slows brain messages to a crawl.

甲状腺素过多会产生过多的静电干扰，大脑的信息很难通过；甲状腺素过少会减缓大脑信息的传递。

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One of the main ways schizophrenia drugs differ is in how they inhibit a brain receptor for dopamine, a key neurotransmitter that is overactive in some parts of a schizophrenic's brain.

FORBES: Magazine Article

We should not have a childhood obesity epidemic and a problem with overactive kids.

FORBES: Kathleen Sebelius Wants Your Kids to Sit Still

Manhattan psychiatrist Drew Ramsey recalled that early in his career, he examined a patient with daily panic attacks and noticed a swelling on her shins, a classic sign of Graves' disease, a form of overactive thyroid that can cause severe anxiety.

WSJ: Confusing Medical Ailments With Mental Illness