Why do people drink coffee?
Coffee contains caffeine which is a stimulant.  It increases wakefulness and alertness.  Too much coffee can cause hyperactivity.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Why do people drink coffee?
### Input: 
### Response: Coffee contains caffeine which is a stimulant.  It increases wakefulness and alertness.  Too much coffee can cause hyperactivity.