Modafinil is a clinically approved medication used to help manage excessive sleepiness linked to conditions such as narcolepsy, shift work sleep disorder, and obstructive sleep apnea. It supports alertness and mental performance by targeting brain pathways involved in wakefulness, helping users stay attentive and mentally sharp for extended periods. Unlike traditional stimulants, modafinil is known for its smoother effects and reduced likelihood of causing restlessness or sudden energy crashes.