You hear people talk about getting a buzz from caffeine. This is because the stimulant actually blocks sleep-inducing chemicals in the brain and increases adrenaline production. Unlike certain vitamins and minerals, the body does not need caffeine - but consuming a moderate amount is associated with any health risks. How much caffeine do you consume, and what is considered a moderate amount?

Most health experts agree that moderate caffeine consumption is defined as 250 milligrams per day - or three 8 oz. cups of coffee. Six or more cups is considered excessive and could be sign of caffeine dependence. Most people report feeling the effects of caffeine about 15 minutes after consumption. Once caffeine enters the body, it remains for quite a long time - and can take up to six hours for just half of the amount consumed to leave the body. Caffeine addiction can lead to sleep abuse and sleep problems. If you suspect someone you know is taking in an excessive amount of caffeine, eliminate consumption and look for signs of withdrawal - like reports of fatigue and headaches.

About the Expert:Lee Loree is the inventor and developer of SLEEPTRACKER, an innovative sleeping watch device that monitors your sleep patterns throughout the night and continuously looks for the optimum moment to wake you up - waking you refreshed from a lite sleep stage.