Modafinil boosts wakefulness. Mostly used to treat narcolepsy, OSA, and shift work sleep disturbance. Modafinil boosts alertness and reduces daytime sleepiness by targeting brain neurotransmitters. The medicine is preferred for improving cognitive function, focus, and mental clarity without the jittery crash of stimulants like caffeine. Modafinil can cause headaches, nausea, sleeplessness, and rarer serious responses, hence it should be used under medical care. Modafinil's efficacy varies, therefore follow dosages to avoid side effects. Before taking Modafinil or any other wakefulness-enhancing drug, visit a doctor to make sure it's safe for you.