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.
That study, published in The Journal of Experimental Education, suggested that any more than two hours of homework per night is counterproductive.
However, students who participated in the study reported doing slightly more than three hours of homework each night, on average.
They reported having little time for relaxing or creative activities.
More than two-thirds of students said they used alcohol and drugs, primarily marijuana, to cope with stress.
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.