People sleep less in mid-adulthood than they do in early and late adulthood, finds a new study. The researchers said the decline in sleep during mid-life may be due to demands of childcare and working life. Sleep duration declines in early adulthood until age 33, and then picks up again at age 53, according to the findings published in Nature Communications.

Across the study sample, people sleep an average of 7.01 hours per night, with women sleeping 7.5 minutes longer than men on average. The study led by University College London, University of East Anglia and University of Lyon researchers involved 730,187 participants spread over 63 countries.