Chronic Fatigue Syndrome
"I&#039;m finishing the second year of my degree (in neuroscience, ironically), only possible because of this medication. I would recommend that anyone with Chronic Fatigue Syndrome try this medication (give it a few weeks). 
Two important things:

1) The medicine has an &#039;inverted U&#039; efficacy. In other words, it doesn&#039;t do more the more you take, the strongest effect is in the middle. &#039;The middle&#039; depends on your body weight, but it&#039;s usually about 200 mg. 

2) DO NOT DRINK ALCOHOL WHILE ON THIS MEDICATION. I get migraines the following day if I drink while taking modafinil. Last time I had three beers at a BBQ and had a migraine for three days following. It might only be me but don&#039;t risk it."