I won't take my second dose after 3pm. I need my sleep.
Also, I found that I had an immediate improvement in my focus and drive. I never felt like crying when I first started. So I'm not sure if that's common or not.
I will say that it was almost impossible to eat for the first few weeks. I had no appetite, which was disconcerting. I had to set an alarm to eat. Sounds like a dream, but not really. Even the idea of eating left me feeling blah.