Same boat here. It didn't make me manic, but it did make me feel insomnia. It even made me feel kind of jittery, sort of like too much caffeine. If anything, it was the opposite of sedating. Just goes to show how people respond differently to meds.

I think if you (OP) ask your doctor about trying to take it in the morning rather than night (or vice versa) I see no reason why they wouldn't be open to the idea. It doesn't hurt to try, see how it goes.