hypersomnia
"I'm 25, diagnosed with ADHD, Anxiety Disorder and Idiopathic Hypersomnia. I've taken Concerta for several years for ADHD.  And was only recently diagnosed with idiopathic hypersomnia. For a while I took both concerta and Ritalin. While it helped to some degree with daytime sleepiness, I still found it impossible to wake up and would frequently crash before I could even make it to bed. Recently I was taken off of Concerta and Ritalin entirely and switched to Modafinil. 

While wake promoting effects aren't quite as strong, they're much more consistent. I'm still tired, but it's much more manageable and easier to wake up. As a plus, since making the switch my anxiety is also much better."