Noise pollution has been described as the 'modern unseen plague.' It is generally accepted that the developed and developing countries are becoming noisier places. For example, mobile phone ring tones have the ability to disturb the most tranquil place at any time of day or night. Humans are responsible for most of the noise that disturbs sleep in the home, whether it is generated outside due to transportation noise or inside because of a loud snoring partner; both are unwelcome.