My personal experiences with modafinil's effects are similar to the OP's. It increases my focus more than caffeine but not like Adderall. It completely clears a

My personal experiences with modafinil's effects are similar to the OP's. It increases my focus more than caffeine but not like Adderall. It completely clears away brain fog and eliminates sleepiness. I find it lasts 6-8 hours for me, depending if I'm sleep deprived or not. I found that if it's evening, I'm tired, and I take it that it may take up to 2 hours before my alertness improves. Normally it's about 1 hour. Other than terrible smelling urine I don't notice any side effects. Modafinil also seems to be synergistic with caffeine. I can take half the caffeine with the same or better effects.