It should be very easy to believe considering the half life of R-modafinil is 15 hours (armodafinil and half of regular modafinil). Even a single dose could ca

It should be very easy to believe considering the half life of R-modafinil is 15 hours (armodafinil and half of regular modafinil). Even a single dose could cause sleep disruption for multiple days and longer if the initial disruption leads to circadian disruption. But it is interesting that both somnolence and insomnia seem to be in the "very common" category (1-10%) of side effects. Sleep disorder is in the "uncommon" (.1-1%) category, which is quite a few people developing sleep disorders taking modafinil. https://www.drugs.com/sfx/modafinil-side-effects.html https://www.drugs.com/sfx/modafinil-side-effects.html