Like Nammu, I take one AP now and do not experience daytime sleepiness, but I have on my current AP in the past, as well as some other AP (or maybe APs). In all cases, as my body adjusted to the medication, the excess sedation passed. Also, sometimes I would have more sedation if my mood was on the lower end. As my mood improved (or elevated), excess sedation would disappear again.

Right now I take 700 mg Seroquel XR, all at night. I had recently also been taking 50 to 150 mg of regular Seroquel during the daytime, because of growing mania. That PRN did help curb my manic flames, but did not tire me much at all.

I usually fall asleep between 10 pm and midnight and always wake up no later than 7 am, but usually earlier. I'll admit that if my moods are level, I don't exactly jump out of bed into a sprint. It usually takes about an hour for me to pick up speed that I maintain throughout the day.

If I forget my evening medications at my usual time (7 to 8 pm), I always eventually figure it out. How? Because I then can't sleep. If I take it at midnight or later, I will be up until at least 3 am. If I totally skipped my evening medications one night, I would get zero sleep. My psychiatrist told me that is because of my moods. I could see that if I was actively manic, but the same happens even if not manic. I think it is a Seroquel withdrawal effect. Either way, I become unwell even after one missed evening dose. That is not the case with my morning medications (Tegretol and Lamictal), though I never usually forget them more than a one-off.