Tired on Contrave?

I am in my second week, taking one pill a day since it's still effective for me, but I am starting to get sooooo tired that I can barely keep my eyes open about an hour after taking my dose. I am seeing everyone else say it keeps them awake so what's going on with me?! I have been taking my pill at around 2pm, since that is when I have my first meal of the day. Anyone else feeling like this?