Energy drinks...how long does the alertness last for?

Question

im up tonight studying (last week of school) drinking rockstar. how long is this alertness gonna last about and whens it gonna crash? its 473ml and 160mg cafeen

Answer 1

I wouldnt try them at night my friend... Sometimes I drink them and they give you a boost for maybe an hour or so but when it crashes... Good lord... It isn't the best feeling youll get.  Also, i dont think is gonna keep you awake... It only makes your blood flow go faster than normal.

Answer 2

They dont even work unless you drink them on an empty stomach.