I believe this claim is true. I have inquired further on a few other websites, all stating that optimal sleep for a college student (18-25 in age) is between 7-9 hours. A study conducted by Harvard Summer School, a subunit of the Harvard Division of Continuing Education, found that 70-96% of college students get less than 8 hours of sleep per each week night during school. Even when students try to catch up on their sleep during the weekend, this is not proven to be a beneficial or permanent solution for the issue at hand. The list of consequences for a sleep deprived college student is quite extensive and can include anything from constant brain fog to incapability to control emotions such as stress. The percentage of college students who get below the recommended hours of sleep really surprised me, and it was something I found interesting when I dug deeper into this study.