That seems like a very powerful medication with a lot of effects and side effects that you would only want to use as a last resort. Wiki says it has effects on serotonin and dopamine receptors, which are also receptors effected by zoloft, so if seroquel helps you then you might want to consider switching to zoloft. But honestly what the hell do either of us know, we're just sharing anecdotes, which is useful but shouldn't be assumed to be true.

it just shuts up you internal monologue for long enough to get to sleep

Though it takes longer to achieve, it's effects go beyond just helping you sleep - regular meditation, even purely secular "mindfulness meditation" can help achieve the same, with lasting effect, and much wider implications in day to day life.

There is sometimes still an internal monologue, but it's not as powerful or overwhelming, and it's much easier to ignore or shut off.