Energy Drink - healthy or not!

Time just flew by.  It is almost the end of the semester.  Everything is coming together: exams, homework and tons of projects.  I have been experiencing the craziest week of this semester.  I did three projects and one exam this week.  I cannot even remember how did I really go through this week.  I have not stayed up so late in the library since my freshmen year.  But I did not leave the library until 2 am for two days this week.  And this Tuesday was the first time that I drank 5-hour energy.  To be honest to you, I was nervous before I drank it because I think drinking this type of energy drink is not healthy at all.  I was reading the details on the bottle.  Under Caution, it states that 5-hour energy contains caffeine comparable to a cup of the leading premium coffee.  After you drink it, you may experience a Niacin Rush (hot feeling, skin redness) that lasts a few minutes.  This is caused by increased blood flow near the skin.  This caution sounds scary to me, but I still drank it because I had to stay up to work on all the mess.  I drank half of the whole bottle.  I was awake for the first one hour, then I literally fell asleep.  I even did not recognize how that happened.  I guess that I was just so tired.  Then I did search the feedback and comments on 5-hour energy online.  I found all different comments.  Someone thinks it is really useful and it helps to stay awake. (At least, it did not work for me.  :(   )  Someone was complaining about the side effects after drinking the 5- hour energy.  After reviewing all different comments, it seems that we do understand that it could be some possible danger after you drink the 5-hour energy.  But no one officially states that we should not drink it.  Please let me know how do you guys think about this kind of energy drink!!