Students need to be studying textbooks, and often academic articles that are typically in tiny print. This can cause eyestrain and worse, especially if the lighting is insufficient. This may well be the case in many student digs.
However, it is more likely that students are staying up late with their eyes on mobile phones, again with tiny detail. the use of TV, ipads and mobile phones has adverse effect upon sleep, and lack of sleep is a key factor in impaired health generally.