There are a few things you can do to get rid of roaches overnight. One is to place boric acid powder in strategic locations where the roaches are likely to walk. Another is to place bait traps, such as small containers filled with water and a bit of sweet syrup, near their hiding places. And finally, you can also seal up any cracks or openings in your walls or floors that they might be using as entry points.

There is no overnight solution when it comes to getting rid of cockroaches. The key is to combine several methods until you find the right one or combination of methods for your specific situation. Some of the most common methods include using bait (either store-bought or homemade), using a roach killer spray, using boric acid powder, and using diatomaceous earth. You can also try sealing up all cracks and crevices in your home where cockroaches might be hiding, as well as cleaning up crumbs and spills immediately.