It really doesn't matter when you take it, as long as you take it at the same time every day.

It's got a long half-life and any 'activating' effects are pretty negligible after your brain adapts to it. In the beginning, you might feel 'activated' for 6-12 hours (most people do not at 10mg) for a few weeks but it sounds like you are past that point and it won't cause insomnia.

Some people even get drowsy on it, so there are diverse reactions.