Identify any strange sounds or smells. Instead of ignoring new sounds and smells, try to guess what it is. If possible, investigate the source to see if you were right or not.[10] For example, if you smell something cooking, guess what food it is. Does it smell like meat, spices, or baked goods? Is it close to you or faint and faraway? If you hear a knocking noise, evaluate your surroundings. Is it coming from a certain wall? Is it a consistent patter or an erratic beat? What might someone be doing to make that noise?