Modafinil is used by all kinds of people men and women to control their sleepy minds. It was American and British militaries that made this drug even more popular. It was used for keeping their soldiers alert and awake. Modafinil improves the functioning of mind for as long as 40 hours. According to the studies and research, modafinil is effective for eliminating bad effects of sleep deprivation on the human brain. It is one of those commonly used drugs that can enhance and improve cognitive performance. If you do not get enough sleep, you should buy modafinil online. However, consult with your doctor before you start taking this drug. You can know about modafinil effects and benefits online, but it is strongly advised to buy modafinil only when your doctor has prescribed it for you.