EEG Study of IV Methylphenidate-Induced Emergence From Propofol Sedation

The investigators are performing this research study to find out if intravenous (IV) methylphenidate (commonly known as Ritalin) can help people recover faster from propofol sedation. The investigators also want to know how IV methylphenidate acts in the brain and whether IV methylphenidate is safe to take with an anesthetic (a drug or agent used to decrease or eliminate the feeling of pain by causing unconsciousness) without causing too many side effects. The brain's electrical activity will be studied and recorded using a machine called an electroencephalogram (EEG).