If you sleep while taking Modalert (modafinil), the medication's intended effects on promoting wakefulness and alertness may be less effective, as it is designed to help you stay awake and combat excessive daytime sleepiness. Modalert 200 mg Australia does not typically induce sleep, so sleeping while on the medication might simply result in a more restful sleep without experiencing the stimulant effects. However, it may affect the timing of your sleep cycle, potentially making it harder to fall asleep at a normal time if taken too late in the day. It is generally recommended to take Modalert in the morning or early afternoon to avoid sleep disruptions.