The number of pillows a person should use varies based on personal preference and sleep habits. Many people prefer to sleep with one pillow for their head and neck support. However, some individuals may require additional pillows for added comfort, such as a body pillow for extra support or decorative pillows for aesthetic purposes. Ultimately, the number of pillows you use is subjective and should be based on what helps you achieve comfortable and restful sleep. Experiment with different pillow arrangements to find what works best for you.