people? Especially for Shift Work Sleep Disorder (that's what I take it for). My doctor wants to put me on Nuvigil after I've been on Provigil for a few years, with little to no negative side effects. I've heard Nuvigil is also more expensive. My doctor can get me a free 30 day trial and $10 co-pay for 12 months following the free trial period. Would it actually be beneficial to myself, my body, to switch after three years?