Modalert 200 (Modafinil) should be taken at specific times depending on the condition being treated. People with narcolepsy or obstructive sleep apnea are usually advised to take this tablet in the morning. This allows the med to promote wakefulness and increase alertness throughout the day. In contrast, for those suffering from shift work sleep disorder (SWSD), Modalert 200 should be taken approximately one hour before the start of the work shift to ensure that its effects are felt during the times when alertness is needed. It is important to follow these timing guidelines to maximize the effectiveness of the med while minimizing the chance of sleep disturbance. For optimal results, always follow your doctor's specific advice.