A new research study out of the University of California, Los Angeles, reports the "somewhat surprising" finding that spending extra time studying tends to negatively affect high school students' academic performance in school the next day. But there's also a perfectly logical explanation for this: When students study more, the researchers found, they tend to sleep less.
For the study, the researchers monitored students at three Los Angeles high schools for 14-day periods three years in a row. They asked the students to complete daily checklists to keep tabs on the amount of time they spent studying each day, how many hours they slept, and their daily academic experiences.
