Everybody's body is different. In the start, for me, it knocked me out within the hour. It wasn't a headache tired for me; I just felt groggy. The first couple of days, I slept in and let my body adjust to the meds. Eventually, I was taking it at night and it didn't make me tired at all (thought it didn't prevent me from falling asleep). However, without fail, it was a pain in the butt to get up. It takes a lot to overcome that morning grogginess. Once you get up and moving for a while, however, it's not that bad. My only other side effects were a bit of dry mouth, occasionally spacing when I was thinking (like a bit of temporary memory loss) and I craved vegetables (weird, I know, but I ate healthier)!

It didn't help my anxiety, but it did help stabilize me a bit. My hypomania was productive and I wasn't quite as depressed.