Sometimes i sleep less then 6 hours...
Same here I wake up like at 6 a.m this semester so it really sucks. You should still try to find a way to sleep before an exam! I admit, I rather feel awake, than be coming into class with baggy eyes and then falling asleep, but too bad college life really makes that hard. I am especially vulnerable to lack of sleep, because I get extremely forgetful. Sometimes I do manage to sleep like at 9 p.m, but that doesn't happen often.
I seriously don't recommend being dependent on coffee because withdrawal symptoms suck.
I do realize you have a pretty tough major, because I know someone else who is also a computer engineer major. I know for a fact that engineers have it tough. Even music education majors like myself have it tough because we have to take classes from both the music department and the education department. It's sort of like a double major, but more flexible.
Do try to relax. Your life will be better after exams...but then there is final exams. >.> That's a completely different story....