Question: If I drink caffeen to stay awake, how long will it take to get out of my system so I can sleep? Please tell me even if you do not know.

Answer: It depends on the amount. Usually 2-3 hours for a small cup of ordinary coffee. I heard that Red Bull has more caffeine, and hot chocolate has less.\nBut some friends of mine CAN go to sleep right after a cup of instant coffee!
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