Losing just two hours of sleep a night makes people angrier, research reveals(表明). The study is among the first to prove a direct link with lack of sleep, experts say.
Previous research shows sleep loss increases negative emotions, such as anxiety and sadness, and decreases positive emotions, including happiness and enthusiasm. But researchers at Iowa State University found losing sleep raised anger directly — not just as a result of feeling more negative. Their findings were published in the Journal of Experimental Psychology.
Participants(参与者) were split into two groups. One kept to their normal sleep routine while the other had theirs cut by two to four hours each night for two nights. The first group had almost seven hours of sleep a night, while the restricted group got about four and a half hours.
Both groups were then asked to rate different products while listening to annoying noise. The researchers said this was meant to create uncomfortable conditions and provoke feelings of anger. Study leader professor Zlatan Krizan said, “In general, anger was substantially higher for those who were sleep-restricted.”
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