Modvigil 200 mg is not used to promote sleep. Rather, it is intended to improve alertness and reduce excessive daytime sleepiness in people with sleep disorders. It is primarily prescribed for conditions such as narcolepsy, obstructive sleep apnea, and shift work sleep disorder, which make it difficult to stay awake and alert during the day or at certain times of the day. Modvigil 200 mg works by stimulating certain areas of the brain that regulate attention, allowing users to stay alert when they feel extremely tired. It does not help you fall asleep, and in fact, taking Modvigil close to bedtime may affect your ability to sleep at night.