I was recently diagnosed with narcolepsy brought on by a brain injury in an accident. My accident was a year and a half ago. I have taken adderal and nuvigil and other amphetamines none worked well enough. I just tried xyrem for the first time last night. I took one 2.25 dose around 2 at night. I am a college student so I have to have some late nights. I slept well but I couldn't get out of bed until 3 the next day I was so tired??? All day I was extra groggy even more so than usual. Is this normal in the beginning? I am becoming hopeless.