This description provides advice on how to get a good night's sleep: Avoiding caffeine is one of the best ways to ensure a good night's sleep. Caffeine is a stimulant that can interfere with the body's natural sleep cycle, making it
From Wikipedia
Caffeine dependence is substance dependence on caffeine. Conditions may include symptoms of tolerance, withdrawal, persistent desire or unsuccessful efforts to control use, and continued use despite knowledge of adverse consequences attributed to caffeine. Such dependence can be physical, psychological, or both.