Why am I tired and unmotivated all the time? Any tips? Please?

I am 30 years old, some people consider this old some don't. But I am an energy drink/supplement junkie and I am tired of this process. I wake up around 9am and I feel like crap, so I slam an energy drink, feel ok for a few hours, slam another one, and the process continues all day until I finally crash around 1am. I have to keep my schedule this way because of work, but I want to stop the energy drinks because they don't work anymore and I always feel like crap now. So any suggestions would help greatly. And no I do not want to do crack or anything stupid like that.
Why am I tired and unmotivated all the time? Any tips? Please?
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