I remember reading the abstract to some studies (which I think I initially saw here) about the effects of Vitamin C on certain ADHD stimulants, in that Vitamin C can reduce the effectiveness of meds and/or counteract compounds in the body. Though I'm not sure exactly which meds are affected and am unsure if it only reduces absorption or actively helps counteract the compounds.

So with that said and taking the above with a grain of salt because i'm a dumbass - maybe some citrus juices or Vitamin C tablets late in the afternoon will assist with winding down?

some more anecdotal statements: I used to struggle with some level of insomnia before i was medicated. I now take 50mg of standard ritalin daily (2 and a half 10mg tabs, twice daily) and I sleep like a rock these days. There are numerous other factors that go into that, but i'll concur with anyone else who comments that "you eventually get used to it". I used to lie awake for hours, now I lie down, put on CPAP mask, turn lights off and i swear i drift off within 20 mins