Why do stuff that supposed give you energy makes me sleepy ? ( for ex. stackers makes me sleepy and it suppose to wake you up and give energy ) ?

The law of gravity: Large doses of sugar or other stimulants boost blood sugar for a while and then it can crash. That's when you feel exhausted. Better to avoid them and eat small frequent meals w/protein, e.g., cheese or peanut butter. Peace and good health. If you look on the label you will see that stacker 2 contains 200 mg of caffeine (stimulant) and food dyes. Not a good idea.