Why a Bad Night's Sleep Keeps Fear Alive

Why a Bad Night's Sleep Keeps Fear Alive

People with insomnia stayed physiologically aroused even after a threat was removed, while good sleepers calmed down — evidence that poor sleep weakens the brain's "safety memory." The finding may explain why anxiety treatments like exposure therapy work better in people who sleep well.

Source

Skin conductance measurements reveal link between insomnia and disrupted fear regulation — News-Medical (Oct 14, 2026), on Hwang, T., et al. (2026), "Disrupted fear regulation in insomnia disorder revealed by arousal estimation from skin conductance," PLOS Mental Health. Study teams: NYU Tandon School of Engineering and Harvard Medical School.

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