I'm also on Concerta, taking 45mg. I started at 27 which was too low for me and went up to 54 which was too high; so we came down to 45 which seems to be a Goldie locks for me (they don't make a 45mg pill so I take an 18 and a 27). I also take 150mg Wellbutrin for depression and balance it all off with a nightly 300mg of Gabapentin to help me sleep (coincidentally my cat is prescribed the same amount of gaba to take before the vet because she's a terror on her check ups).

This is all is relatively new for me (got diagnosed this year after being misdiagnosed with depression for a very long time) and it's working out OK. One thing I'm still struggling with is break days. They seem to supercharge my (inattentive) ADHD, and I'm kind of dead all day long; maybe there's still room for adjustment and I go back to 36mg Concerta.