Early Bedtime May Boost Exercise Success, Major Study Finds
A new wave of research from Harvard Medical School, Brigham and Women’s Hospital, and Monash University reveals that going to bed earlier can significantly increase the time and frequency of daily physical activity—suggesting the ancient proverb, “early to bed and early to rise,” has more merit than ever for health-conscious individuals.
The findings, published in June in the Proceedings of the National Academy of Sciences, draw on detailed sleep and activity data from nearly 20,000 Americans over the course of a year. Researchers analyzed 6 million “person-nights” of daily logs collected from widely used wearable fitness trackers, making this study one of the largest and most robust of its kind to date. According to the data, people who went to bed earlier—compared to their own usual pattern—were more likely to engage in longer and more frequent bouts of moderate-to-vigorous physical activity the next day. Importantly, this effect was most pronounced for individuals who had previously been logging short nights of rest. For example, people who typically slept five hours per night ended up getting a substantial increase—around 41.5 extra minutes—of moderate-to-vigorous activity the following day, compared to those regularly sleeping nine hours.