It is common knowledge that consuming caffeine close to bedtime may interfere with sleep patterns and keep you awake. A new study published in Science Translational Medicine found that caffeine may further impact our sleeping patterns by effecting our circadian rhythms. Circadian rhythms are 24 hour oscillating cycles that regulate physiological processes, such as telling our body when to sleep. Disruptions of this body clock my cause problems with eating and sleeping and cause adverse health effects such as obesity and cardiovascular disease. It seems that caffeine has an effect in the release of melatonin, which effects our circadian rhythm and our ability to sleep. The bottom line? Save the caffeine for the morning hours to ensure your biological clock continues to work properly.