The researchers asked students whether they experienced physical symptoms of stress, such as headaches, exhaustion, sleep deprivation, weight loss, and stomach problems.
More than 80 percent of students reported having at least one stress-related symptom in the past month, and 44 percent said they had experienced three or more symptoms.
The researchers also found that spending too much time on homework meant that students were not meeting their developmental needs or cultivating other critical life skills.
Students were more likely to forgo activities, stop seeing friends or family, and not participate in hobbies.
And all those extra assignments may lead to family stress, especially when parents with limited education aren’t confident in their ability to talk with the school about their child’s work.
Some parents, in fact, have decided to opt out of the whole thing.
The Washington Post reported in 2016 that some parents have just instructed their younger children not to do their homework assignments.
They report the no-homework policy has taken the stress out of their afternoons and evenings.
The research involved a series of interviews with students, teachers, and administrators, as well as a survey of a total of 128 juniors from two private high schools.
About half of the students said they received at least three hours of homework per night.