The immediate effects of which include poorer memory and reaction times, which would explain that familiar Monday morning feeling of sluggishness, says Independent Online. A study at Chicago's Rush University say sleeping in at the weekend can leave us too tired for the start of the working week, with many remaining groggy until Wednesday.
Lead researcher Helen Burgess said the problem arises when, having shifted their body clocks with a couple of lie-ins, many face a "rude awakening" with an earlier start for work on Monday morning, Independent Online reports.
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