Gains from homework in primary school are derisory and not much better in middle school. Even in high school the gains are a quarter of a standard deviation. Not worth the enormous cost in time, sleep and stress.
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Homework and attainment in primary schools
https://onlinelibrary.wiley.com/doi/abs/10.1080/014119299025...
The findings indicated that the highest test scores were achieved by those pupils who reported doing homework ‘once a month’ in each of the core subjects. Homework reported more frequently than ‘once a month’ was generally associated with lower attainment. Multilevel models that controlled for important variables did not lend support to the ‘more is better’ view of homework.
Special Topic / The Case For and Against Homework
http://www.ascd.org/publications/educational-leadership/mar0...
Although teachers across the K–12 spectrum commonly assign homework, research has produced no clear-cut consensus on the benefits of homework at the early elementary grade levels. In his early meta-analysis, Cooper (1989a) reported the following effect sizes (p. 71):
Grades 4–6: ES = .15 (Percentile gain = 6)
Grades 7–9: ES = .31 (Percentile gain = 12)
Grades 10–12: ES = .64 (Percentile gain = 24)