I used to take it all at night because I couldn't handle it in the morning. I was working and when I got to work I had to lie down and take a nap so I took my morning dose and my evening dose at the same time. I got psychotic every afternoon like this.
Then I started taking it in the morning again and I got over the drowsiness. It doesn't make me sleepy at all anymore and I don't get psychotic every afternoon anymore so I know that it's working. It made all the difference in the world.
I take it on an empty stomach every morning. It works just fine.