Evaluation of Modafinil vs Placebo for Treatment of Anesthesia Delayed Emergence in Obstructive Sleep Apnea

Inclusion Criteria: 1. 18 years or older 2. Meets diagnostic criteria for obstructive sleep apnea 3. Willing and able to comply with study procedures 4. Willing and able to provide informed consent 5. If female, not pregnant or lactating and willing to use an acceptable method of barrier birth control (e.g. condoms) for one month after surgery and discontinuation of study medication (modafinil may reduce the effectiveness of steroidal contraception for one month after discontinuation) Exclusion Criteria: 1. Have a medical condition that, in the study physician's judgment, may interfere with safe participation (active cardiac conditions such as angina, recent myocardial infarction w/in 6 months, severe renal or liver disease, unstable diabetes, or elevated liver enzymes greater than twice normal). 2. Have a current neurological disorder (e.g. organic brain disease, dementia) or major psychiatric condition that would impair the collection of data (schizophrenia, bipolar illness). 3. Currently on prescription medication that is known to interact with the study drug. (ethinylestradiol and triazolam). 4. Have current dependence on cocaine, methamphetamine, alcohol or benzodiazepines (DSM-IV criteria). 5. Have a history of severe valvular heart disease, severe left ventricular hypertrophy, cardiac arrhythmias, angina, cardiac syncope, or pre-syncope or myocardial infarction \<6 months. 6. Have a history of uncontrolled or poorly controlled essential hypertension, or a heart rate greater than 70% of the maximum heart rate expected for their age (Formula: 0.70(220 - age). 7. Any condition, in the opinion of the principal investigators that would compromise patient safety. 8. A documented history of sensitivity to modafinil. 9. Current Modafinil use for daytime somnolence associated with obstructive sleep apnea.