Started taking sertraline and actually sleeping

Been on it for 3 weeks. First two weeks felt weird and nauseous but my doctor said stick with it. This past week I've slept through the night 4 times—FOUR TIMES—without waking up at 3am spiraling about random things. My anxiety is still there but it's like the volume turned down? Don't know if that's placebo or the meds but honestly don't care. Should've done this months ago but kept telling myself I could "handle it." Sometimes you can't.