What is the reason reason why stimulants can cause restlessness and hyperactivity

The reason behind why stimulants causes an individual to become restless and hyperactive, it is because stimulants are considered to be psychoactive drugs, which means it affects the brain, which makes the brain work faster or react faster than normal, it stimulates the body which results to continuous restlessness and hyperactivity.

answer; i do believe the correct answer is (25) times faster;