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Why just one sleepless night makes people emotionally fragile

In healthy individuals, good-quality sleep is linked with a more positive mood—and it takes just one night of sleep deprivation to trigger a robust spike in anxiety and depression the following morning. Moreover, people who suffer from chronic sleep disruption tend to experience daily events as more negative, making it hard to escape a gloomy mindset. In a national sleep survey, 85% of Americans reported mood disruption when they were not able to get enough sleep.