Some people find that modafinil helps them focus, primarily by increasing alertness and decreasing weariness. It is prescribed by doctors for sleep-related disorders that make it hard to stay awake, such as narcolepsy and shift work sleep disorder. A person may have improved focus, mental clarity, and the capacity to remain focused on tasks for extended periods of time while taking a dose like Modalert 200. It is not a certain way to improve cognitive function, though, and the impact varies from person to person. Rather than a direct gain in intellect or memory, improvements in attention frequently result from heightened awareness.