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Can Caffeine Replace Sleep, To An Extent? Can Too Much Caffeine Be Dangerous?

By Elizabeth Scott, M.S., About.com

Updated: October 03, 2007

About.com Health's Disease and Condition content is reviewed by the Medical Review Board

Question: Can Caffeine Replace Sleep, To An Extent? Can Too Much Caffeine Be Dangerous?

I tend to get less sleep than other people get, but I make up for it with caffeine. I know that after a certain point, this could be bad for me. But what about just using a couple of cups in the morning to get me going and an afternoon coffee to keep myself alert? Is this a problem?

Answer: There are mixed feelings, even among experts, when it comes to caffeine. While it’s agreed that too much can be detrimental, some experts feel that a moderate amount of caffeine can actually be good for you. (See this article on caffeine and stress to find out if your level of caffeine is good or bad.)

That said, there’s another issue at play here: sleep. We often underestimate the importance of sleep, or our own need for it, especially if we’re able to mask our need for it with drugs like caffeine (yes, it is a drug!), and convince ourselves we aren’t really sleep-deprived. However, studies show that a sleep deficit can be dangerous, and can threaten our productivity as well as our health. If your coffee is a sleep substitute, you can be depriving yourself of something you really need without noticing the ill effects of its absence, and there may be long term consequences.

Another potential problem with caffeine is that, in addition to helping you get by without the sleep you need and thereby lowering your motivation to prioritize your seven or more hours a night, caffeine can sabotage quality sleep by interfering with your body’s rhythms and hamper your ability to fall and stay asleep. This can become a real problem because it can further convince you that you don’t really need as much sleep as your body in fact requires, and it prevents you from taking advantage of the time to sleep when it’s available.

My recommendation is that you keep your caffeine intake to two coffee drinks per day, and don’t consume it past lunch time or very early afternoon. Also, it’s very important to schedule in enough time for quality sleep so you can regularly average at least seven hours. If you still find yourself in need of extra energy, try these natural energy enhancers instead.

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