Narcolepsy (a condition that causes excessive daytime sleepiness) and shift work sleep disorder (sleepiness during scheduled waking hours and difficulty falling or staying asleep during scheduled sleeping hours in people who work at night or on rotating shifts) are both conditions that result in excessive daytime sleepiness that are treated with modafinil. The extreme drowsiness brought on by obstructive sleep apnea/hypopnea syndrome is also treated with modafinil, breathing machines, or other methods.

Wakefulness-promoting agents, which include modAlert 200 mg, are a group of drugs. It works by altering the concentrations of several natural chemicals in the region of the brain that regulates Alertness and sleep.

For the purpose of reducing excessive drowsiness brought on by sleep apnea or hypopnea syndrome, modafinil is often used in conjunction with other breathing medications and other sleep therapies. A patient with this sleeping problem would either abruptly cease breathing or breathe slowly over the course of sleep, which would result in the patient having less rest and sleep.