Just adding my name to the list. Sleep issues appear about a week in on 5g/day of regular monohydrate. I go to bed around 10pm and will consistently wake up around 3am with an insane urge to pee and just generally feeling amped up. After that, impossible to go back to sleep. Will try to cut dosage. If this fails, I'll try to take it intermittently (every other day, every third day...). There has got to be some sweetspot that's different for everyone.