Another Coffee Study

Kanko* / CC

Morning person? You might want to go easy on the coffee. A study found that caffeine intake during the day is more likely to disrupt a morning person’s sleep than a night owl’s. Researchers had 50 college students track their caffeine intake and sleep patterns for a week; the students were equipped with wrist sensors that revealed whether they’d woken up during the night. Since they were typical sleep-deprived college kids, they tended to sleep well regardless of how much caffeine they consumed, says a researcher at Stanford. Still, the more caffeine present in the early birds’ systems, the longer they spent awake after first dozing off.