I've not tried Piracetam but I've taken Picamilon 50mg in the hope of it helping anxiety. The first time I took it, after around 10-15 minutes I experienced a euphoria which lasted around 5 seconds. It was weird as I didn't expect to feel this, and although I've taken Picamilon around four times since, I've not experienced this euphoria again.
Picamilon felt a lot like l-theanine to me, relaxing but I also felt energized and a little agitated but not in a bad way. I actually found it quite difficult to sit still, like I needed to be on the go doing things and I did feel more focused and didn't feel as tired like I do from l-theanine. I haven't tried taking it before bed as I don't think I may be able to sleep due to its energizing effect, or a higher dose for the same reason. Anyway, this is just my experience of it.