What are anti-sleep Pills students are popping to cram for exams?

A class 10 student from Lucknow, was reportedly diagnosed with a brain clot due to abuse of ‘anti-sleep pills'. Anti-sleep pills help staying awake & feel more alert. They are prescribed to people with a sleep disorder known as narcolepsy. Doctors say this medication should never be sold without a prescription, it can cause side effects or psychological dependence.