I should now be able to use the toilet in the middle of the night without trying to walk through the minefield of creaky floor boards while terrified of waking up my wife. She’s lethal when she’s disturbed. We’ve (the builders) are installing an extra layer of flooring designed to stop impact noise. The boards have a hard sponge material on one side designed to soften the impact when walking. I was always unsure of the solution as it decreases the rooms head-hight, however, I couldn’t notice the difference once I stood on it. We were amazed at how effective the solution works.