Is it true that COFFEE can keep you awake?

I really don't know everyone one says so but let me tell you one thing we always use to do when i was in hostel completing my graduation I was our part 1 exams and I along with few others would be up studying late mid night,one of had a stove in his room so at about 1-2a.m he use to make a good cup of coffee for everyone awake then of we went to bed so i really don't whether we had that cup of coffee to keep us awake or go to sleep

Well I donot drink either coffee or tea. But I heard that tea works better than coffee in this context. I also heard that when we take coffee, we sleep early. Is it true?

no i don't think so it is true.

not true at all. i have an aunt who drinks like 5 cups a day and still manage to sleep as early as 8 and sleeps like a baby, too. about 8 hours!

Based on my experience, i can't sleep at all after i drink coffee. it happened so many times and i promised myself not to drink coffee anymore if i want to have a good night sleep. I guess it's not applicable to everyone.