Is an extra cup of joe part of your afternoon routine? If so, you may be prone to negative sleep effects, according to a recent study in the Journal of Clinical Sleep Medicine. The study found that drinking coffee at the end of the work day or after work can disrupt an individual' sleep patterns as much as drinking a cup right before bed. But many fail to make the connection between afternoon coffee and sleep problems, according to the researchers. According to Dr. Steven Feinsilver, director of the Center for Sleep Medicine at Mount Sinai Hospital, many people are unaware of just how much caffeine they consume routinely. This affects both getting to sleep and staying asleep, and the results can last up to 12 hours.