How much caffeine should I drink to pull an all nighter?

Don't pull "All nighters!" get your "8 hrs sleep", -you can still drink some coffee, but it's like a "drug"-I do get my "sleep" & I drink it from the time I awake to the time i go on my coffee-breaks/lunch/my last break, till the time I go home... I'm hooked on it-If I don't drink it, I'm a "zombie" & I couldn't stay awake on the job at "work"- (My favorite is ice cream & coffee-like a sweet coffee float)