Reading Comprehension

Read the text and answer the question.

Researchers studying sleep have found that many people perform better when they accept that they are 'night owls' rather than forcing themselves into early schedules. In one workplace experiment, employees were allowed to choose their own start times within a flexible window. Those who naturally woke late and began work mid-morning reported fewer errors and less fatigue than when they had been required to arrive at dawn. The study's authors caution that flexible hours are not possible in every job, but they argue that, where feasible, matching work to a person's natural rhythm can improve both health and output.