I guess yes. Seroquel XR and Seroquel IR (both together). I write "guess" because if I didn't take them I would not sleep, or barely. To some degree withdrawal would be a factor, but if I stopped them I'd surely become manic, which would also affect my sleep. However, when I was not on any medications before ever taking them, I could sleep when depressed (hypersomnia, in fact) and when reasonably stable. Insomnia has never been a discomfort for me. When manic (or hypomanic), I didn't miss sleep.

On the rare occasions I struggle to fall asleep on my Seroquels, I have permitted tools that help. A little extra Seroquel or an Ativan on top of it all. Only if non-chemical aids fall short (i.e. my sound machine, a yogurt, "shut off my brain" strategies, etc.)

What about your behavior has improved since taking bipolar medications?