People with certain sleep disorders may struggle to stay awake and alert during the day, affecting daily activities and productivity. Modafinil tablets is a prescription medication commonly used to promote wakefulness in conditions such as narcolepsy, obstructive sleep apnea, and shift work sleep disorder. It should be taken only under the guidance of a healthcare professional. Possible side effects include headache, nausea, and insomnia, so following the prescribed dosage is essential for safe and effective use.