Individuals who feel sleepy and wish to maintain alertness often consume over-the-counter stimulants such as caffeine in coffee. More specifically, it has been shown that high-frequency low-dose caffeine intake is effective at countering poor work performance effects due to extended wakefulness, confirming the hypothesis that adenosine is a mediator of performance decrements associated with extended wakefulness.[49] Other stimulants that could decrease microsleep frequency include Adderall, amphetamine, cocaine, and tobacco.[50][51]