The article begins by discussing how sleep deprivation is an issue and can impact shift workers, especially nurses. Niu says that this is a problem because nurses have to make very important decisions that require full attention and precision. In order to see if sleep deprivation decreases attention in nurses, they collected demographics of 30 participant nurses. They also used sleep diaries to collect data on how much sleep the participants get per day. In addition, after participants completed a work shift, they were given the d2 test to measure attention. The group was split into 3 phases, the first phase being day shift vs day shift workers, the second being day shift vs evening shift workers, and the third being day shift vs. night shift
