Provigil, also known as Modafinil, is prescribed to promote wakefulness in individuals with narcolepsy, sleep apnea, or shift work sleep disorder. It helps improve alertness without the jittery effects of stimulants. Provigil works by influencing certain brain chemicals that regulate sleep and wake cycles. It is often used to improve daytime focus and reduce excessive sleepiness. Proper dosing and medical guidance help minimize side effects such as headache or insomnia.