a whole body of research shows that
Naptime is not just for kids .A whole body of research shows that a mid-day nap can evidently increase and alertness in the workplace.
A whole body of research
根据前面的Naptime is not just for kids .(午休不仅仅是孩子们得事.),我感觉这里它是不是说:对各个阶层的人的研究