When I first started risperidone, it would knock me out within an hour of taking it (even at my starting dose of 1/2 mg). After about a month though, it no longer made me tired, even when it was increased several times. I take it in both the morning (1 mg) and evening (2mg) now and sleep as a "normal" person would sleep (don't fall asleep too early, wake up at a normal time, etc.).

For me it became less sedating as time passed.