I think studies like this are important to determine the importance of sleep and the right amount. For example, this study suggests that too much sleep is harmf

I think studies like this are important to determine the importance of sleep and the right amount. For example, this study suggests that too much sleep is harmful, which isn't a universally agreed-on point. Additionally, sleeping isn't a binary thing. People do mini cost-benefit analyses: sleep an extra hour vs do more work? Sleep vs talk to a friend? Sleep more or spend time eating a slow, healthy breakfast? Maybe the health benefits of sitting down and eating a healthy breakfast outweigh the benefits of sleeping by a large margin, although both are helpful. More research could help people make decisions about how much they sleep.