Curlew,
There is a reason that the side of the can has a warning not to consume more than a certain amount per 24 hour period. With energy drinks such as Red Bull and Monster, each can consumed strips off a layer of protective cells which line the inside of your stomach, and keep the acid you use to digest contained within. These are known as epithelium, and without them, you can quickly develop ulcers. In an absolute worst case scenario, you can actually cause the stomach wall to fail as the acid eats through.(through prolonged large intake of these drinks...and it takes ALOT) Should that happen, you would most likely die, unless very near a high grade emergency facility.
This is in addition to the problems caused by over consumption of caffeine, which you may easily look up for yourself.
I consume no more than 2 Monsters per day, and even then that puts me on the threshhold for problems.
Your study habits indicate that you've done one of two things...
1)Procrastinated the entire semester..(something I saw often as a biology instructor)
or..
2)Taken too many credits or are completely over your head in the subject matter
Only you can figure out which it is. All nighters at the end of a semester is a sign of poor study habits. Your brain will only take in upwards of 20-30 minutes of new information and convert it into formation of synapses. After that, it runs out of "steam", and needs at least 15 minutes of downtime. Studying all night gives you absolutely zero reward, in the end. You should look to learn your required material during the semester, not at the end. As an undergrad, I used to laugh at how everyone disappeared the week of finals.... and at how they marvelled at my 95 without seeming to study...while they were ruining an entire week for high 70's. College (at least academically) is all about pre-planning and goal setting. I found that after I started doing that, I found alot more time to do more "interesting" things.