The Queensland Times - - WEEKEND -

Los­ing just two hours of sleep a night makes peo­ple an­grier, re­search re­veals.

The study is among the first to prove a di­rect link with lack of shut-eye, 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, US, found los­ing sleep raised anger di­rectly – not just as a re­sult of feel­ing more neg­a­tive.

Par­tic­i­pants 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.

The dif­fer­ence was de­signed to re­flect what peo­ple reg­u­larly ex­pe­ri­ence in ev­ery­day life.

Par­tic­i­pants in both groups were then asked to rate var­i­ous prod­ucts while lis­ten­ing to ir­ri­tat­ing 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.

“We ma­nip­u­lated how an­noy­ing the noise was dur­ing the task and, as ex­pected, peo­ple re­ported more anger when the noise was more un­pleas­ant.

“When sleep was re­stricted, peo­ple re­ported even more anger, re­gard­less of the noise.”

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