Passage (Questions 96-100)Sleep is not a luxury but a biological necessity. During sleep the brain consolidates what has been learned durin…

Passage (Questions 96-100)
Sleep is not a luxury but a biological necessity. During sleep the brain consolidates what has been learned during the day, moving fragile memories into long-term storage. Students who sleep less than six hours before an examination often perform worse than those who study less but rest well. Yet in many schools, early starting times and heavy homework loads push adolescents to cut their sleep. Researchers have found that when a few schools delayed their start by an hour, attendance improved, teenagers reported a better mood and the number of road accidents involving teenagers fell. Critics worry that later schedules disturb family routines and sports practice, but the benefits to health and learning appear to outweigh these inconveniences.

Which of the following was NOT reported by researchers after some schools delayed their start by an hour?