How many cups of coffee or energy drinks do you have a day? Do you understand about caffeine content? Most people rely on caffeine to get them through the day, if this sounds like you, then this post may be worth a read.

Caffeine isn't bad at all, but, like anything, too much of it can be bad for you. The problem arrises with the Adrenal glands. Adrenal glands function to produce hormones essential to life. The adrenal medulla is the inner portion of the adrenal gland, and produces adrenaline and noradrenaline.

The adrenal cortex is the outer portion of the adrenal gland, and produces cortisol, estrogen, progesterone and testosterone. Cortisol regulates other hormones, balances metabolism and manages immune function. Chronic stress, such as that incurred by daily consumption of caffeine, creates a situation of sustained high levels of cortisol.
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Cortisol is pretty much the stress hormone, therefore elevated levels of stress, cause people to struggle to sleep, therefore in the morning and throughout the day they become heavily dependant on caffeine to pull them through the day, then due to the mass of caffeine they consume they then struggle to sleep again!

Little do they know that the caffeine is impacting on their adrenal health. 
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Find the route cause of your stress and workout a way to eliminate it, a couple of coffees spaced out throughout the day isn't bad at all, nor is an energy drink(within reason). But just be aware if you rely on caffeine and what its actually doing to you. 
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If you are on 6+ cups of coffee a day, don't by any means go cold turkey, for a week just try 4/5, let your body adjust and then knock it down to 3/4 and so on... give the body and mind time to adjust, just like your muscles do with exercise.